diff --git a/frontend/app/features/platform/ModelPlatformApp copy.tsx b/frontend/app/features/platform/ModelPlatformApp copy.tsx
deleted file mode 100644
index ce6500a..0000000
--- a/frontend/app/features/platform/ModelPlatformApp copy.tsx	
+++ /dev/null
@@ -1,1513 +0,0 @@
-import {
-  type ChangeEvent,
-  type FormEvent,
-  type MouseEvent as ReactMouseEvent,
-  useEffect,
-  useMemo,
-  useRef,
-  useState,
-} from "react";
-import { useLocation, useNavigate } from "react-router";
-
-import {
-  type ActiveEditSession,
-  type LatestVersion,
-  type ScriptItem,
-  type ScriptType,
-  type StableVersion,
-  type Visibility,
-  type WorkspaceDirectory,
-} from "../../services/api";
-import { useApi, useAuth } from "../../context/AuthContext";
-import Icon from "../../components/common/Icon";
-import SchedulePage from "../schedules/SchedulePage";
-import { DashboardPage, SystemAdminPage } from "../admin/AdminPages";
-import "../../styles/platform.css";
-import { WorkspaceTreeGroup, scriptIcon } from "./WorkspaceTree";
-import { ScriptWorkspace } from "./ScriptWorkspace";
-
-
-type NewScriptForm = {
-  name: string;
-  scriptType: ScriptType;
-  visibility: Visibility;
-  parentPath: string;
-};
-
-type ContextMenuState = {
-  x: number;
-  y: number;
-  kind: "root" | "directory" | "file";
-  path: string;
-  script?: ScriptItem;
-};
-
-type ToastState = {
-  tone: "success" | "error" | "info";
-  message: string;
-};
-
-const navigation = [
-  { label: "工作台", icon: "home" as const, page: "home" as const },
-  { label: "构建脚本", icon: "script" as const, page: "scripts" as const },
-  { label: "调度配置", icon: "schedule" as const, page: "schedules" as const },
-  { label: "系统管理", icon: "settings" as const, page: "system" as const },
-];
-
-type ActivePage = "home" | "scripts" | "schedules" | "system";
-
-function pageFromPath(pathname: string): ActivePage {
-  const page = pathname.replace(/^\/+|\/+$/g, "");
-  return ["scripts", "schedules", "system"].includes(page)
-    ? page as ActivePage
-    : "home";
-}
-
-function pathForPage(page: ActivePage): string {
-  return page === "home" ? "/workbench" : `/${page}`;
-}
-
-const initialForm: NewScriptForm = {
-  name: "",
-  scriptType: "notebook",
-  visibility: "workspace",
-  parentPath: "",
-};
-
-function ownedScriptPath(item: ScriptItem) {
-  return item.relative_path.replaceAll("\\", "/").split("/").slice(2).join("/");
-}
-
-function parentOf(path: string) {
-  const parts = path.split("/");
-  parts.pop();
-  return parts.join("/");
-}
-
-function inferredDirectories(items: ScriptItem[]): WorkspaceDirectory[] {
-  const result = new Map<string, WorkspaceDirectory>();
-  for (const item of items) {
-    const parts = parentOf(ownedScriptPath(item)).split("/").filter(Boolean);
-    let parentPath = "";
-    for (const name of parts) {
-      const path = parentPath ? `${parentPath}/${name}` : name;
-      result.set(path, { path, name, parent_path: parentPath });
-      parentPath = path;
-    }
-  }
-  return [...result.values()];
-}
-
-function mergeDirectories(
-  left: WorkspaceDirectory[],
-  right: WorkspaceDirectory[],
-): WorkspaceDirectory[] {
-  return [...new Map(
-    [...left, ...right].map((item) => [item.path, item]),
-  ).values()];
-}
-export default function ModelPlatformApp() {
-  const { currentWorkspace } = useAuth();
-  if (!currentWorkspace) {
-    return (
-      <div className="app-shell" style={{ display: "flex", alignItems: "center", justifyContent: "center" }}>
-        <div style={{ textAlign: "center" }}>
-          <span style={{ fontSize: 18 }}>加载中…</span>
-        </div>
-      </div>
-    );
-  }
-  return <AuthenticatedModelPlatformApp />;
-}
-
-function AuthenticatedModelPlatformApp() {
-  const location = useLocation();
-  const navigate = useNavigate();
-  const activePage = pageFromPath(location.pathname);
-  const auth = useAuth();
-  const { user, workspaces, setCurrentWorkspace, logout } = auth;
-  const currentWorkspace = auth.currentWorkspace!;
-  const api = useApi();
-  const [scripts, setScripts] = useState<ScriptItem[]>([]);
-  const [directories, setDirectories] = useState<WorkspaceDirectory[]>([]);
-  const [selectedId, setSelectedId] = useState<string | null>(null);
-  const [openTabIds, setOpenTabIds] = useState<string[]>([]);
-  const [keyword, setKeyword] = useState("");
-  const [loading, setLoading] = useState(true);
-  const [refreshing, setRefreshing] = useState(false);
-  const [apiOnline, setApiOnline] = useState(false);
-  const [createOpen, setCreateOpen] = useState(false);
-  const [creating, setCreating] = useState(false);
-  const [form, setForm] = useState<NewScriptForm>(initialForm);
-  const [folderDialog, setFolderDialog] = useState<{
-    open: boolean;
-    parentPath: string;
-    name: string;
-    busy: boolean;
-  }>({ open: false, parentPath: "", name: "", busy: false });
-  const [contextMenu, setContextMenu] = useState<ContextMenuState | null>(null);
-  const [workspaceMenuOpen, setWorkspaceMenuOpen] = useState(false);
-  const [uploadParentPath, setUploadParentPath] = useState("");
-  const [uploading, setUploading] = useState(false);
-  const uploadInputRef = useRef<HTMLInputElement | null>(null);
-  const [toast, setToast] = useState<ToastState | null>(null);
-  const [editSession, setEditSession] = useState<ActiveEditSession | null>(null);
-  const editSessionRef = useRef<ActiveEditSession | null>(null);
-  const selectedIdRef = useRef<string | null>(null);
-  const editorOpenRequestRef = useRef(0);
-  const editorOpeningRef = useRef(false);
-  const [embeddedJupyterUrl, setEmbeddedJupyterUrl] =
-    useState<string | null>(null);
-  const [editBusy, setEditBusy] = useState(false);
-  const [editorOpenError, setEditorOpenError] = useState<{
-    scriptId: string;
-    message: string;
-  } | null>(null);
-  const [latestVersion, setLatestVersion] = useState<LatestVersion | null>(
-    null,
-  );
-  const [latestVersionLoading, setLatestVersionLoading] = useState(false);
-  const [publishTarget, setPublishTarget] = useState<ScriptItem | null>(null);
-  const [releaseNote, setReleaseNote] = useState("");
-  const [publishVisibility, setPublishVisibility] =
-    useState<Visibility>("workspace");
-  const [publishing, setPublishing] = useState(false);
-  const [publishedVersion, setPublishedVersion] =
-    useState<StableVersion | null>(null);
-  const [sidebarCollapsed, setSidebarCollapsed] = useState(false);
-
-  const load = async (silent = false) => {
-    if (!silent) setLoading(true);
-    setRefreshing(silent);
-    try {
-      const [items, folderItems] = await Promise.all([
-        api.listScripts(),
-        api.listWorkspaceDirectories(),
-      ]);
-      setScripts(items);
-      setDirectories(folderItems);
-      setApiOnline(true);
-      setSelectedId((current) => {
-        if (current && items.some((item) => item.script_id === current)) {
-          selectedIdRef.current = current;
-          return current;
-        }
-        const nextSelectedId = (
-          items.find((item) => item.script_type === "notebook")?.script_id
-          ?? items[0]?.script_id
-          ?? null
-        );
-        selectedIdRef.current = nextSelectedId;
-        return nextSelectedId;
-      });
-    } catch (error) {
-      setApiOnline(false);
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "脚本列表加载失败",
-      });
-    } finally {
-      setLoading(false);
-      setRefreshing(false);
-    }
-  };
-
-  useEffect(() => {
-    void load();
-  }, []);
-
-  useEffect(() => {
-    if (!toast) return;
-    const timer = window.setTimeout(() => setToast(null), 3200);
-    return () => window.clearTimeout(timer);
-  }, [toast]);
-
-  useEffect(() => {
-    if (!contextMenu) return;
-    const close = () => setContextMenu(null);
-    const closeOnEscape = (event: KeyboardEvent) => {
-      if (event.key === "Escape") close();
-    };
-    window.addEventListener("pointerdown", close);
-    window.addEventListener("blur", close);
-    window.addEventListener("resize", close);
-    window.addEventListener("scroll", close, true);
-    window.addEventListener("keydown", closeOnEscape);
-    return () => {
-      window.removeEventListener("pointerdown", close);
-      window.removeEventListener("blur", close);
-      window.removeEventListener("resize", close);
-      window.removeEventListener("scroll", close, true);
-      window.removeEventListener("keydown", closeOnEscape);
-    };
-  }, [contextMenu]);
-
-  useEffect(() => {
-    editSessionRef.current = editSession;
-  }, [editSession]);
-
-  useEffect(() => {
-    if (!selectedId) {
-      setLatestVersion(null);
-      return;
-    }
-    let ignore = false;
-    setLatestVersionLoading(true);
-    void api.getLatestScriptVersion(selectedId)
-      .then((item) => {
-        if (!ignore) setLatestVersion(item);
-      })
-      .catch((error) => {
-        if (!ignore) {
-          setToast({
-            tone: "error",
-            message:
-              error instanceof Error
-                ? error.message
-                : "最新版本加载失败",
-          });
-        }
-      })
-      .finally(() => {
-        if (!ignore) setLatestVersionLoading(false);
-      });
-    return () => {
-      ignore = true;
-    };
-  }, [selectedId]);
-
-  useEffect(() => {
-    if (!editSession) return;
-    const intervalSeconds = Math.max(
-      5,
-      editSession.heartbeat_interval_seconds || 15,
-    );
-    let heartbeatRunning = false;
-    const timer = window.setInterval(() => {
-      if (heartbeatRunning) return;
-      const current = editSessionRef.current;
-      if (!current || current.edit_session_id !== editSession.edit_session_id) {
-        return;
-      }
-      heartbeatRunning = true;
-      void api.heartbeatFileLock(current)
-        .then((updated) => {
-          setEditSession((active) => active
-            && active.edit_session_id === updated.edit_session_id
-            ? {
-                ...active,
-                session_status: updated.session_status,
-                expires_at: updated.expires_at,
-              }
-            : active);
-        })
-        .catch((error) => {
-          setEditSession(null);
-          setEmbeddedJupyterUrl(null);
-          setToast({
-            tone: "error",
-            message: `编辑锁心跳已中断：${
-              error instanceof Error ? error.message : "请重新打开文件"
-            }`,
-          });
-        })
-        .finally(() => {
-          heartbeatRunning = false;
-        });
-    }, intervalSeconds * 1000);
-    return () => window.clearInterval(timer);
-  }, [editSession?.edit_session_id, editSession?.heartbeat_interval_seconds]);
-
-  useEffect(() => {
-    if (!editSession?.ticket_expires_at) return;
-    const expiresAt = new Date(editSession.ticket_expires_at).getTime();
-    const renewAfter = Math.max(15_000, expiresAt - Date.now() - 60_000);
-    const timer = window.setTimeout(() => {
-      const current = editSessionRef.current;
-      if (!current || current.edit_session_id !== editSession.edit_session_id) {
-        return;
-      }
-      void api.createJupyterAccessTicket(current)
-        .then((ticket) => {
-          setEditSession((active) => active
-            && active.edit_session_id === ticket.edit_session_id
-            ? { ...active, ticket_expires_at: ticket.expires_at }
-            : active);
-        })
-        .catch((error) => {
-          setToast({
-            tone: "error",
-            message: `Jupyter 访问票据续签失败：${
-              error instanceof Error ? error.message : "请重新打开文件"
-            }`,
-          });
-        });
-    }, renewAfter);
-    return () => window.clearTimeout(timer);
-  }, [editSession?.edit_session_id, editSession?.ticket_expires_at]);
-
-  useEffect(() => {
-    if (!editSession) return;
-    const handleUnload = () => {
-      const current = editSessionRef.current;
-      if (current) api.releaseFileLockOnUnload(current);
-    };
-    window.addEventListener("beforeunload", handleUnload);
-    return () => window.removeEventListener("beforeunload", handleUnload);
-  }, [editSession?.edit_session_id]);
-
-  const filteredScripts = useMemo(() => {
-    const normalized = keyword.trim().toLocaleLowerCase();
-    if (!normalized) return scripts;
-    return scripts.filter((item) =>
-      item.script_name.toLocaleLowerCase().includes(normalized),
-    );
-  }, [keyword, scripts]);
-
-  const memberScriptGroups = (() => {
-    const currentUserScripts = filteredScripts.filter(
-      (item) => item.owner_user_id === user?.user_id,
-    );
-    const inferred = inferredDirectories(currentUserScripts);
-    return [{
-      user: user,
-      scripts: currentUserScripts,
-      directories: mergeDirectories(directories, inferred),
-    }];
-  })();
-  const selected = scripts.find((item) => item.script_id === selectedId) ?? null;
-
-  const selectScript = (scriptId: string | null) => {
-    setSelectedId(scriptId);
-  };
-
-  const openTab = (scriptId: string) => {
-    if (selectedIdRef.current !== scriptId) {
-      editorOpenRequestRef.current += 1;
-      setEditorOpenError(null);
-    }
-    selectedIdRef.current = scriptId;
-    setSelectedId(scriptId);
-    setOpenTabIds((current) => {
-      if (current.includes(scriptId)) {
-        return current;
-      }
-      return [...current, scriptId];
-    });
-  };
-
-  const closeTab = async (scriptId: string, event?: ReactMouseEvent) => {
-    event?.stopPropagation();
-
-    // 如果关闭的是正在编辑的脚本，先释放编辑锁
-    if (editSessionRef.current?.script_id === scriptId) {
-      await endEditing(false, false);
-    }
-
-    setOpenTabIds((current) => {
-      const index = current.indexOf(scriptId);
-      if (index === -1) return current;
-      const newTabs = current.filter((id) => id !== scriptId);
-      if (selectedId === scriptId) {
-        const nextId = newTabs[index] ?? newTabs[index - 1] ?? null;
-        setSelectedId(nextId);
-        selectedIdRef.current = nextId;
-      }
-      return newTabs;
-    });
-  };
-
-  const switchTab = (scriptId: string) => {
-    if (selectedIdRef.current !== scriptId) {
-      editorOpenRequestRef.current += 1;
-      setEditorOpenError(null);
-    }
-    setSelectedId(scriptId);
-    selectedIdRef.current = scriptId;
-  };
-
-  const openScriptEditor = async (
-    script: ScriptItem,
-    showToast = true,
-  ) => {
-    if (editorOpeningRef.current) return;
-    editorOpeningRef.current = true;
-    const requestId = editorOpenRequestRef.current + 1;
-    editorOpenRequestRef.current = requestId;
-    const requestIsCurrent = () =>
-      editorOpenRequestRef.current === requestId
-      && selectedIdRef.current === script.script_id;
-    const clearSessionIfActive = (session: ActiveEditSession) => {
-      if (
-        editSessionRef.current?.edit_session_id === session.edit_session_id
-      ) {
-        setEmbeddedJupyterUrl(null);
-        setEditSession(null);
-        editSessionRef.current = null;
-      }
-    };
-
-    setEditBusy(true);
-    setEditorOpenError((current) =>
-      current?.scriptId === script.script_id ? null : current);
-    let active = editSessionRef.current;
-    let newlyAcquired = false;
-    try {
-      if (active && active.script_id !== script.script_id) {
-        await api.releaseFileLock(active);
-        setEmbeddedJupyterUrl(null);
-        setEditSession(null);
-        editSessionRef.current = null;
-        active = null;
-      }
-      if (!requestIsCurrent()) return;
-
-      if (!active) {
-        active = await api.acquireFileLock(script);
-        newlyAcquired = true;
-      }
-      if (!requestIsCurrent()) {
-        if (active) {
-          await api.releaseFileLock(active);
-          clearSessionIfActive(active);
-        }
-        return;
-      }
-
-      const ticket = await api.createJupyterAccessTicket(active);
-      if (!requestIsCurrent()) {
-        await api.releaseFileLock(active);
-        clearSessionIfActive(active);
-        return;
-      }
-
-      const readySession = {
-        ...active,
-        ticket_expires_at: ticket.expires_at,
-      };
-      setEditSession(readySession);
-      editSessionRef.current = readySession;
-      setEmbeddedJupyterUrl(ticket.jupyter_url);
-      if (showToast) {
-        setToast({
-          tone: "success",
-          message: `${script.script_name} 已打开，Jupyter 已嵌入当前工作区`,
-        });
-      }
-    } catch (error) {
-      if (newlyAcquired && active) {
-        try {
-          await api.releaseFileLock(active);
-        } catch {
-          // The database lease is the final safety net if compensation cannot reach Runtime.
-        }
-        setEditSession(null);
-        editSessionRef.current = null;
-      }
-      setEmbeddedJupyterUrl(null);
-      if (requestIsCurrent()) {
-        const message = error instanceof Error ? error.message : "打开编辑器失败";
-        setEditorOpenError({ scriptId: script.script_id, message });
-        if (showToast) {
-          setToast({ tone: "error", message });
-        }
-      }
-    } finally {
-      editorOpeningRef.current = false;
-      setEditBusy(false);
-    }
-  };
-
-  useEffect(() => {
-    if (
-      activePage !== "scripts"
-      || !selected
-      || selected.script_type !== "notebook"
-      || editBusy
-      || editorOpenError?.scriptId === selected.script_id
-      || (
-        editSession?.script_id === selected.script_id
-        && embeddedJupyterUrl
-      )
-    ) {
-      return;
-    }
-
-    void openScriptEditor(selected, false);
-  }, [
-    activePage,
-    editBusy,
-    editSession?.script_id,
-    editorOpenError?.scriptId,
-    embeddedJupyterUrl,
-    selected?.script_id,
-    selected?.script_type,
-  ]);
-
-  const endEditing = async (closeTabFlag = true, showToast = true) => {
-    editorOpenRequestRef.current += 1;
-    setEditorOpenError(null);
-    const active = editSessionRef.current;
-    const scriptId = active?.script_id;
-    if (!active) {
-      if (closeTabFlag && scriptId) {
-        void closeTab(scriptId);
-      }
-      return;
-    }
-    setEditBusy(true);
-    try {
-      await api.releaseFileLock(active);
-      setEmbeddedJupyterUrl(null);
-      setEditSession(null);
-      editSessionRef.current = null;
-      if (closeTabFlag && scriptId) {
-        void closeTab(scriptId);
-      }
-      if (showToast) {
-        setToast({
-          tone: "success",
-          message: `${active.script_name} 的编辑锁已释放`,
-        });
-      }
-    } catch (error) {
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "释放编辑锁失败",
-      });
-    } finally {
-      setEditBusy(false);
-    }
-  };
-
-  useEffect(() => {
-    const active = editSessionRef.current;
-    if (
-      !active
-      || !selected
-      || selected.script_type === "notebook"
-      || selected.script_id === active.script_id
-      || editBusy
-    ) {
-      return;
-    }
-    void endEditing(false, false);
-  }, [editBusy, selected?.script_id, selected?.script_type]);
-
-  useEffect(() => {
-    if (
-      activePage === "scripts"
-      || editBusy
-      || (!editSessionRef.current && !editorOpeningRef.current)
-    ) {
-      return;
-    }
-    void endEditing(true, false);
-  }, [activePage, editBusy]);
-
-  const openPublishDialog = (script: ScriptItem) => {
-    setPublishTarget(script);
-    setReleaseNote("");
-    setPublishVisibility(
-      script.visibility === "private" ? "private" : "workspace",
-    );
-  };
-
-  const submitPublish = async (event: FormEvent) => {
-    event.preventDefault();
-    if (!publishTarget) return;
-    setPublishing(true);
-    try {
-      const version = await api.publishScriptVersion({
-        script: publishTarget,
-        releaseNote,
-        visibility: publishVisibility,
-      });
-      setPublishTarget(null);
-      setPublishedVersion(version);
-      setToast({
-        tone: "success",
-        message: `${version.version_label} 稳定版本发布成功`,
-      });
-    } catch (error) {
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "稳定版本发布失败",
-      });
-    } finally {
-      setPublishing(false);
-    }
-  };
-
-  const submitCreate = async (event: FormEvent) => {
-    event.preventDefault();
-    if (!form.name.trim()) return;
-    const suffix = form.scriptType === "notebook" ? ".ipynb" : ".py";
-    const requestedName = form.name.trim();
-    const normalizedName = requestedName.toLocaleLowerCase().endsWith(suffix)
-      ? requestedName
-      : `${requestedName}${suffix}`;
-    const duplicate = scripts.some((script) =>
-      script.script_type === form.scriptType
-      && script.script_name.toLocaleLowerCase() === normalizedName.toLocaleLowerCase()
-    );
-    if (duplicate) {
-      setToast({ tone: "error", message: `${normalizedName} 已存在，请更换名称` });
-      return;
-    }
-    setCreating(true);
-    try {
-      const created = await api.createScript(form);
-      setScripts((items) => [created, ...items]);
-      openTab(created.script_id);
-      setCreateOpen(false);
-      setForm(initialForm);
-      setToast({
-        tone: "success",
-        message: `${created.script_name} 已创建`,
-      });
-    } catch (error) {
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "创建失败",
-      });
-    } finally {
-      setCreating(false);
-    }
-  };
-
-  const openCreateDialog = (
-    parentPath = "",
-    scriptType: ScriptType = "notebook",
-  ) => {
-    setContextMenu(null);
-    setForm({
-      ...initialForm,
-      parentPath,
-      scriptType,
-    });
-    setCreateOpen(true);
-  };
-
-  const openFolderDialog = (parentPath = "") => {
-    setContextMenu(null);
-    setFolderDialog({
-      open: true,
-      parentPath,
-      name: "",
-      busy: false,
-    });
-  };
-
-  const chooseUpload = (parentPath = "") => {
-    setContextMenu(null);
-    setUploadParentPath(parentPath);
-    uploadInputRef.current?.click();
-  };
-
-  const handleUpload = async (event: ChangeEvent<HTMLInputElement>) => {
-    const files = Array.from(event.target.files ?? []);
-    event.target.value = "";
-    if (files.length === 0) return;
-    setUploading(true);
-    let lastCreated: ScriptItem | null = null;
-    try {
-      for (const file of files) {
-        lastCreated = await api.uploadScript(file, uploadParentPath);
-      }
-      await load(true);
-      if (lastCreated) selectScript(lastCreated.script_id);
-      setToast({
-        tone: "success",
-        message: `${files.length} 个文件已上传到${
-          uploadParentPath ? ` ${uploadParentPath}` : "当前目录"
-        }`,
-      });
-    } catch (error) {
-      await load(true);
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "文件上传失败",
-      });
-    } finally {
-      setUploading(false);
-    }
-  };
-
-  const submitFolder = async (event: FormEvent) => {
-    event.preventDefault();
-    if (!folderDialog.name.trim()) return;
-    setFolderDialog((current) => ({ ...current, busy: true }));
-    try {
-      await api.createWorkspaceDirectory(
-        folderDialog.name.trim(),
-        folderDialog.parentPath,
-      );
-      await load(true);
-      setFolderDialog({
-        open: false,
-        parentPath: "",
-        name: "",
-        busy: false,
-      });
-      setToast({
-        tone: "success",
-        message: `${folderDialog.name.trim()} 文件夹已创建`,
-      });
-    } catch (error) {
-      setFolderDialog((current) => ({ ...current, busy: false }));
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "文件夹创建失败",
-      });
-    }
-  };
-
-  const removeScript = async (script: ScriptItem) => {
-    setContextMenu(null);
-    if (!window.confirm(`确定删除文件“${script.script_name}”吗？稳定版本会保留。`)) {
-      return;
-    }
-    if (editSessionRef.current?.script_id === script.script_id) {
-      await endEditing(false, false);
-      if (editSessionRef.current?.script_id === script.script_id) return;
-    }
-    try {
-      await api.deleteScript(script.script_id);
-      if (selectedIdRef.current === script.script_id) selectScript(null);
-      await load(true);
-      setToast({
-        tone: "success",
-        message: `${script.script_name} 已删除`,
-      });
-    } catch (error) {
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "文件删除失败",
-      });
-    }
-  };
-
-  const removeDirectory = async (path: string) => {
-    setContextMenu(null);
-    if (!window.confirm(`确定递归删除文件夹“${path}”及其内容吗？稳定版本会保留。`)) {
-      return;
-    }
-    const activeScript = scripts.find(
-      (item) => item.script_id === editSessionRef.current?.script_id,
-    );
-    if (
-      activeScript
-      && (
-        ownedScriptPath(activeScript) === path
-        || ownedScriptPath(activeScript).startsWith(`${path}/`)
-      )
-    ) {
-      await endEditing(false, false);
-      if (editSessionRef.current?.script_id === activeScript.script_id) return;
-    }
-    try {
-      const result = await api.deleteWorkspaceDirectory(path);
-      const selectedScript = scripts.find(
-        (item) => item.script_id === selectedIdRef.current,
-      );
-      if (
-        selectedScript
-        && ownedScriptPath(selectedScript).startsWith(`${path}/`)
-      ) {
-        selectScript(null);
-      }
-      await load(true);
-      setToast({
-        tone: "success",
-        message: `${path} 已删除（含 ${result.deleted_scripts} 个脚本）`,
-      });
-    } catch (error) {
-      setToast({
-        tone: "error",
-        message: error instanceof Error ? error.message : "文件夹删除失败",
-      });
-    }
-  };
-
-  const showContextMenu = (
-    event: ReactMouseEvent,
-    target: Omit<ContextMenuState, "x" | "y">,
-  ) => {
-    event.preventDefault();
-    event.stopPropagation();
-    const width = 188;
-    const height = target.kind === "file" ? 92 : 190;
-    setContextMenu({
-      ...target,
-      x: Math.min(event.clientX, window.innerWidth - width - 8),
-      y: Math.min(event.clientY, window.innerHeight - height - 8),
-    });
-  };
-
-  return (
-    <div className="app-shell">
-      <aside className={`sidebar${sidebarCollapsed ? " is-collapsed" : ""}`}>
-        <div className="brand">
-          <span className="brand__mark"><Icon name="brand" size={31} /></span>
-          {!sidebarCollapsed && <span className="brand__name">模型实验开发平台</span>}
-        </div>
-
-        {!sidebarCollapsed && (
-        <nav className="navigation" aria-label="主导航">
-          {navigation.map((item) => (
-            <button
-              className={`nav-item${
-                item.page === activePage ? " nav-item--active" : ""
-              }`}
-              key={item.label}
-              type="button"
-              onClick={() => {
-                if (item.page !== "scripts") {
-                  if (editSessionRef.current) {
-                    void endEditing(true);
-                  } else {
-                    selectScript(null);
-                  }
-                }
-                navigate(pathForPage(item.page));
-              }}
-            >
-              <Icon name={item.icon} size={19} />
-              <span>{item.label}</span>
-            </button>
-          ))}
-        </nav>
-        )}
-
-        <button className="sidebar-footer" type="button" onClick={() => setSidebarCollapsed((v) => !v)}>
-          <Icon name="menu" size={19} />
-          <span>{sidebarCollapsed ? "展开菜单" : "收起菜单"}</span>
-        </button>
-      </aside>
-
-      <main className="main-area">
-        <header className="topbar">
-          <div className="page-title">
-            <button className="icon-button icon-button--back" type="button">
-              <Icon name="chevron" size={19} />
-            </button>
-            <div>
-              <span className="page-title__eyebrow">开发工作区</span>
-              <h1>{{
-                home: "工作台",
-                scripts: "构建脚本",
-                schedules: "调度配置",
-                system: "系统管理",
-              }[activePage]}</h1>
-            </div>
-          </div>
-          <div className="topbar__actions">
-            <div className="api-state">
-              <span className={`api-state__dot${apiOnline ? " is-online" : ""}`} />
-              {apiOnline ? "服务已连接" : "服务未连接"}
-            </div>
-            <div className="topbar-menu-wrap">
-              <button className="workspace-switcher" type="button" onClick={() => { setWorkspaceMenuOpen((value) => !value); }}>
-                <span className="workspace-switcher__icon"><Icon name="workspace" size={18} /></span>
-                <span><small>当前 Workspace</small><strong>{currentWorkspace.workspace_name}</strong></span>
-                <Icon name="chevron" size={15} />
-              </button>
-              {workspaceMenuOpen && (
-                <div className="topbar-dropdown">
-                  {workspaces.map((workspace) => (
-                    <button className={workspace.workspace_id === currentWorkspace.workspace_id ? "is-selected" : ""} type="button" key={workspace.workspace_id} onClick={() => { setCurrentWorkspace(workspace.workspace_id); setWorkspaceMenuOpen(false); }}>
-                      <Icon name="workspace" size={15} /><span><strong>{workspace.workspace_name}</strong><small>{workspace.workspace_id === currentWorkspace.workspace_id ? "当前使用" : "点击切换"}</small></span>
-                    </button>
-                  ))}
-                </div>
-              )}
-            </div>
-            <div className="topbar-menu-wrap">
-              <button className="user-menu" type="button">
-                <span className="avatar">{user?.display_name?.slice(0, 1) ?? "?"}</span>
-                <span className="user-menu__copy"><strong>{user?.display_name ?? "未知用户"}</strong><small>{user?.role_code === "admin" ? "管理员" : "开发人员"}</small></span>
-              </button>
-              <button className="text-button" type="button" onClick={() => { logout(); window.location.assign("/login"); }}>
-                登出
-              </button>
-            </div>
-          </div>
-        </header>
-
-        {activePage === "scripts" ? (
-        <section className="workspace-layout">
-          <aside className="explorer">
-            <div className="explorer__header">
-              <div>
-                <h2>脚本目录</h2>
-                <span>{scripts.length} 个工作副本</span>
-              </div>
-              <div className="explorer__actions">
-                <button
-                  className="text-button"
-                  type="button"
-                  disabled={uploading}
-                  onClick={() => chooseUpload("")}
-                >
-                  <Icon name="upload" size={15} />
-                  {uploading ? "上传中…" : "上传"}
-                </button>
-                <input
-                  ref={uploadInputRef}
-                  className="visually-hidden"
-                  type="file"
-                  accept=".py,.ipynb"
-                  multiple
-                  onChange={(event) => void handleUpload(event)}
-                />
-                <button
-                  className="text-button"
-                  type="button"
-                  onClick={() => openCreateDialog("")}
-                >
-                  <Icon name="plus" size={16} />
-                  新建
-                </button>
-              </div>
-            </div>
-
-            <div className="search-box">
-              <Icon name="search" size={17} />
-              <input
-                aria-label="搜索脚本"
-                placeholder="搜索脚本名称"
-                value={keyword}
-                onChange={(event) => setKeyword(event.target.value)}
-              />
-              <button
-                className={refreshing ? "is-spinning" : ""}
-                type="button"
-                aria-label="刷新脚本"
-                onClick={() => void load(true)}
-              >
-                <Icon name="refresh" size={16} />
-              </button>
-            </div>
-
-            <div className="tree-scroll">
-              {loading ? (
-                <div className="tree-skeleton">
-                  <span /><span /><span /><span />
-                </div>
-              ) : (
-                <>
-                  {memberScriptGroups.map((group) => (
-                    <WorkspaceTreeGroup
-                      key={group.user?.user_id ?? "anon"}
-                      title={`${group.user?.display_name}的文件`}
-                      scripts={group.scripts}
-                      directories={group.directories}
-                      selectedId={selectedId}
-                      onSelect={openTab}
-                      onContextMenu={
-                        group.user?.user_id === user?.user_id
-                          ? showContextMenu
-                          : undefined
-                      }
-                      readOnly={group.user?.user_id !== user?.user_id}
-                    />
-                  ))}
-                  {filteredScripts.length === 0 && (
-                    <div className="tree-empty">
-                      <span className="tree-empty__icon">
-                        <Icon name="script" size={24} />
-                      </span>
-                      <strong>{keyword ? "没有匹配脚本" : "还没有构建脚本"}</strong>
-                      <p>
-                        {keyword
-                          ? "换个关键词试试"
-                          : "新建 Notebook 或 Python 脚本开始实验"}
-                      </p>
-                      {!keyword && (
-                        <button type="button" onClick={() => openCreateDialog("")}>
-                          <Icon name="plus" size={15} />
-                          新建脚本
-                        </button>
-                      )}
-                    </div>
-                  )}
-                </>
-              )}
-            </div>
-          </aside>
-
-          <section className="editor-area">
-            {selected ? (
-              <ScriptWorkspace
-                key={selected.script_id}
-                script={selected}
-                editSession={
-                  editSession?.script_id === selected.script_id
-                    ? editSession
-                    : null
-                }
-                jupyterUrl={
-                  editSession?.script_id === selected.script_id
-                    ? embeddedJupyterUrl
-                    : null
-                }
-                editBusy={editBusy}
-                openError={
-                  editorOpenError?.scriptId === selected.script_id
-                    ? editorOpenError.message
-                    : null
-                }
-                latestVersion={latestVersion}
-                versionsLoading={latestVersionLoading}
-                openTabs={openTabIds.map((id) => {
-                  const s = scripts.find((item) => item.script_id === id);
-                  return {
-                    scriptId: id,
-                    scriptName: s?.script_name ?? "未知",
-                    scriptType: s?.script_type ?? "notebook",
-                  };
-                })}
-                onOpenEditor={() => void openScriptEditor(selected)}
-                onEndEditing={() => void endEditing()}
-                onClose={(scriptId, event) => void closeTab(scriptId, event)}
-                onSwitchTab={switchTab}
-                onNewTab={() => openCreateDialog("")}
-                onPublish={() => openPublishDialog(selected)}
-                onInfo={setToast}
-              />
-            ) : (
-              <div className="welcome-panel">
-                <div className="welcome-panel__visual">
-                  <Icon name="script" size={42} />
-                </div>
-                <span className="welcome-panel__label">构建脚本工作台</span>
-                <h2>创建你的第一个模型脚本</h2>
-                <p>
-                  通过 Notebook 完成数据探索，或使用 Python
-                  脚本构建可调度的处理任务。
-                </p>
-                <button className="primary-button" onClick={() => openCreateDialog("")}>
-                  <Icon name="plus" size={17} />
-                  新建构建脚本
-                </button>
-              </div>
-            )}
-          </section>
-        </section>
-        ) : activePage === "schedules" ? (
-          <SchedulePage
-            key={`${user?.user_id ?? "anon"}-${currentWorkspace?.workspace_id ?? "none"}`}
-            onNotify={setToast}
-            onConnectionChange={setApiOnline}
-          />
-        ) : activePage === "system" ? (
-          <SystemAdminPage
-            key={`${user?.user_id ?? "anon"}-${currentWorkspace?.workspace_id ?? "none"}`}
-            onNotify={setToast}
-            onConnectionChange={setApiOnline}
-          />
-        ) : (
-          <DashboardPage
-            scriptCount={scripts.length}
-            online={apiOnline}
-            onNavigate={(page) => {
-              navigate(pathForPage(page));
-            }}
-          />
-        )}
-      </main>
-
-      {createOpen && (
-        <div className="modal-backdrop" role="presentation">
-          <section className="modal" role="dialog" aria-modal="true">
-            <div className="modal__header">
-              <div>
-                <span className="modal__eyebrow">工作副本</span>
-                <h2>新建构建脚本</h2>
-              </div>
-              <button
-                className="icon-button"
-                type="button"
-                aria-label="关闭"
-                onClick={() => setCreateOpen(false)}
-              >
-                <Icon name="close" />
-              </button>
-            </div>
-            <form onSubmit={submitCreate}>
-              <div className="destination-chip">
-                <Icon name="folder" size={16} />
-                保存到：{form.parentPath || "个人根目录"}
-              </div>
-              <label className="form-field">
-                <span>脚本名称</span>
-                <input
-                  autoFocus
-                  maxLength={255}
-                  placeholder={form.scriptType === "notebook"
-                    ? "例如：数据探索"
-                    : "例如：data_process"}
-                  value={form.name}
-                  onChange={(event) =>
-                    setForm((current) => ({
-                      ...current,
-                      name: event.target.value,
-                    }))}
-                />
-                <small>
-                  系统会自动补充
-                  {form.scriptType === "notebook" ? " .ipynb" : " .py"} 后缀
-                </small>
-              </label>
-
-              <fieldset className="type-picker">
-                <legend>脚本类型</legend>
-                <button
-                  className={form.scriptType === "notebook" ? "is-selected" : ""}
-                  type="button"
-                  onClick={() => setForm((current) => ({
-                    ...current,
-                    scriptType: "notebook",
-                  }))}
-                >
-                  <span className="type-picker__icon type-picker__icon--notebook">
-                    <Icon name="notebook" size={22} />
-                  </span>
-                  <span>
-                    <strong>Jupyter Notebook</strong>
-                    <small>交互式数据探索与模型实验</small>
-                  </span>
-                  <span className="type-picker__check">
-                    <Icon name="check" size={14} />
-                  </span>
-                </button>
-                <button
-                  className={form.scriptType === "python" ? "is-selected" : ""}
-                  type="button"
-                  onClick={() => setForm((current) => ({
-                    ...current,
-                    scriptType: "python",
-                  }))}
-                >
-                  <span className="type-picker__icon type-picker__icon--python">
-                    <Icon name="python" size={23} />
-                  </span>
-                  <span>
-                    <strong>Python 脚本</strong>
-                    <small>批处理、训练和模型调用任务</small>
-                  </span>
-                  <span className="type-picker__check">
-                    <Icon name="check" size={14} />
-                  </span>
-                </button>
-              </fieldset>
-
-              <label className="form-field">
-                <span>可见范围</span>
-                <select
-                  value={form.visibility}
-                  onChange={(event) =>
-                    setForm((current) => ({
-                      ...current,
-                      visibility: event.target.value as Visibility,
-                    }))}
-                >
-                  <option value="private">仅自己可见</option>
-                  <option value="workspace">Workspace 成员可见</option>
-                  <option value="public">公开</option>
-                </select>
-              </label>
-
-              <div className="modal__footer">
-                <button
-                  className="secondary-button"
-                  type="button"
-                  onClick={() => setCreateOpen(false)}
-                >
-                  取消
-                </button>
-                <button
-                  className="primary-button"
-                  type="submit"
-                  disabled={creating || !form.name.trim()}
-                >
-                  {creating ? <span className="button-spinner" /> : <Icon name="plus" size={16} />}
-                  {creating ? "正在创建…" : "创建脚本"}
-                </button>
-              </div>
-            </form>
-          </section>
-        </div>
-      )}
-
-      {folderDialog.open && (
-        <div className="modal-backdrop" role="presentation">
-          <section className="modal modal--compact" role="dialog" aria-modal="true">
-            <div className="modal__header">
-              <div>
-                <span className="modal__eyebrow">WORKSPACE</span>
-                <h2>新建文件夹</h2>
-              </div>
-              <button
-                className="icon-button"
-                type="button"
-                aria-label="关闭"
-                onClick={() => setFolderDialog((current) => ({
-                  ...current,
-                  open: false,
-                }))}
-              >
-                <Icon name="close" />
-              </button>
-            </div>
-            <form onSubmit={submitFolder}>
-              <div className="destination-chip">
-                <Icon name="folder" size={16} />
-                创建到：{folderDialog.parentPath || "个人根目录"}
-              </div>
-              <label className="form-field">
-                <span>文件夹名称</span>
-                <input
-                  autoFocus
-                  maxLength={255}
-                  placeholder="例如：模型训练"
-                  value={folderDialog.name}
-                  onChange={(event) => setFolderDialog((current) => ({
-                    ...current,
-                    name: event.target.value,
-                  }))}
-                />
-              </label>
-              <div className="modal__footer">
-                <button
-                  className="secondary-button"
-                  type="button"
-                  onClick={() => setFolderDialog((current) => ({
-                    ...current,
-                    open: false,
-                  }))}
-                >
-                  取消
-                </button>
-                <button
-                  className="primary-button"
-                  type="submit"
-                  disabled={folderDialog.busy || !folderDialog.name.trim()}
-                >
-                  {folderDialog.busy
-                    ? <span className="button-spinner" />
-                    : <Icon name="folder" size={16} />}
-                  {folderDialog.busy ? "正在创建…" : "创建文件夹"}
-                </button>
-              </div>
-            </form>
-          </section>
-        </div>
-      )}
-
-      {contextMenu && (
-        <div
-          className="tree-context-menu"
-          role="menu"
-          style={{ left: contextMenu.x, top: contextMenu.y }}
-          onPointerDown={(event) => event.stopPropagation()}
-        >
-          {contextMenu.kind === "file" && contextMenu.script ? (
-            <>
-              <button
-                type="button"
-                role="menuitem"
-                onClick={() => {
-                  selectScript(contextMenu.script!.script_id);
-                  setContextMenu(null);
-                }}
-              >
-                <Icon name="script" size={16} />
-                打开文件
-              </button>
-              <button
-                className="is-danger"
-                type="button"
-                role="menuitem"
-                onClick={() => void removeScript(contextMenu.script!)}
-              >
-                <Icon name="close" size={16} />
-                删除文件
-              </button>
-            </>
-          ) : (
-            <>
-              <button
-                type="button"
-                role="menuitem"
-                onClick={() => openCreateDialog(contextMenu.path, "notebook")}
-              >
-                <Icon name="notebook" size={16} />
-                新建 Notebook
-              </button>
-              <button
-                type="button"
-                role="menuitem"
-                onClick={() => openCreateDialog(contextMenu.path, "python")}
-              >
-                <Icon name="python" size={16} />
-                新建 Python 文件
-              </button>
-              <button
-                type="button"
-                role="menuitem"
-                onClick={() => openFolderDialog(contextMenu.path)}
-              >
-                <Icon name="folder" size={16} />
-                新建文件夹
-              </button>
-              <button
-                type="button"
-                role="menuitem"
-                onClick={() => chooseUpload(contextMenu.path)}
-              >
-                <Icon name="upload" size={16} />
-                上传到此处
-              </button>
-              {contextMenu.kind === "directory" && (
-                <>
-                  <span className="tree-context-menu__separator" />
-                  <button
-                    className="is-danger"
-                    type="button"
-                    role="menuitem"
-                    onClick={() => void removeDirectory(contextMenu.path)}
-                  >
-                    <Icon name="close" size={16} />
-                    删除文件夹
-                  </button>
-                </>
-              )}
-            </>
-          )}
-        </div>
-      )}
-
-      {publishTarget && (
-        <div className="modal-backdrop" role="presentation">
-          <section className="modal publish-modal" role="dialog" aria-modal="true">
-            <div className="modal__header">
-              <div>
-                <span className="modal__eyebrow">不可变制品</span>
-                <h2>发布稳定版本</h2>
-              </div>
-              <button
-                className="icon-button"
-                type="button"
-                aria-label="关闭"
-                onClick={() => setPublishTarget(null)}
-              >
-                <Icon name="close" />
-              </button>
-            </div>
-            <form onSubmit={submitPublish}>
-              <div className="publish-source">
-                <span className={`file-icon file-icon--${publishTarget.script_type}`}>
-                  <Icon name={scriptIcon(publishTarget)} size={18} />
-                </span>
-                <span>
-                  <strong>{publishTarget.script_name}</strong>
-                  <small>当前 Workspace 工作副本</small>
-                </span>
-              </div>
-              <label className="form-field">
-                <span>发布说明</span>
-                <textarea
-                  maxLength={1000}
-                  placeholder="例如：完成数据清洗和特征工程"
-                  value={releaseNote}
-                  onChange={(event) => setReleaseNote(event.target.value)}
-                />
-                <small>稳定版本内容不可修改，可作为后续调度节点输入。</small>
-              </label>
-              <label className="form-field">
-                <span>可见范围</span>
-                <select
-                  value={publishVisibility}
-                  onChange={(event) =>
-                    setPublishVisibility(event.target.value as Visibility)}
-                >
-                  <option value="private">仅自己可见</option>
-                  <option value="workspace">Workspace 成员可见</option>
-                  <option value="public">公开</option>
-                </select>
-              </label>
-              <div className="modal__footer">
-                <button
-                  className="secondary-button"
-                  type="button"
-                  onClick={() => setPublishTarget(null)}
-                >
-                  取消
-                </button>
-                <button
-                  className="primary-button"
-                  type="submit"
-                  disabled={publishing}
-                >
-                  {publishing
-                    ? <span className="button-spinner" />
-                    : <Icon name="release" size={16} />}
-                  {publishing ? "正在发布…" : "确认发布"}
-                </button>
-              </div>
-            </form>
-          </section>
-        </div>
-      )}
-
-      {publishedVersion && (
-        <div className="modal-backdrop" role="presentation">
-          <section className="modal version-receipt" role="dialog" aria-modal="true">
-            <div className="version-receipt__check">
-              <Icon name="check" size={28} />
-            </div>
-            <span className="modal__eyebrow">STABLE VERSION</span>
-            <h2>稳定版本发布成功</h2>
-            <p>
-              {publishedVersion.version_label} 已成为不可变制品，
-              后续调度将通过 versions_id 引用它。
-            </p>
-            <div className="version-id-box">
-              <span>versions_id</span>
-              <code>{publishedVersion.versions_id}</code>
-              <button
-                type="button"
-                onClick={() => {
-                  void navigator.clipboard.writeText(
-                    publishedVersion.versions_id,
-                  );
-                  setToast({ tone: "success", message: "versions_id 已复制" });
-                }}
-              >
-                复制
-              </button>
-            </div>
-            <button
-              className="primary-button version-receipt__close"
-              type="button"
-              onClick={() => setPublishedVersion(null)}
-            >
-              完成
-            </button>
-          </section>
-        </div>
-      )}
-
-      {toast && (
-        <div className={`toast toast--${toast.tone}`} role="status">
-          <span>
-            <Icon name={toast.tone === "success" ? "check" : "info"} size={17} />
-          </span>
-          {toast.message}
-        </div>
-      )}
-    </div>
-  );
-}
diff --git a/frontend/app/features/platform/ModelPlatformApp.tsx b/frontend/app/features/platform/ModelPlatformApp.tsx
index 9474406..8aa48f0 100644
--- a/frontend/app/features/platform/ModelPlatformApp.tsx
+++ b/frontend/app/features/platform/ModelPlatformApp.tsx
@@ -134,7 +134,7 @@ function AuthenticatedModelPlatformApp() {
   // Toast 通知
   const [toast, setToast] = useState<ToastState | null>(null);
 
-  // 编辑会话相关
+  // 编辑会话相关 - 为每个标签维护独立 iframe 和状态
   const [editSession, setEditSession] = useState<ActiveEditSession | null>(null);
   const editSessionRef = useRef<ActiveEditSession | null>(null);
   const selectedIdRef = useRef<string | null>(null);
@@ -147,6 +147,14 @@ function AuthenticatedModelPlatformApp() {
     message: string;
   } | null>(null);
 
+  // 为每个打开的标签维护独立的缓存会话（多 iframe 共存方案）
+  interface CachedSession {
+    session: ActiveEditSession;
+    jupyterUrl: string;
+    lastActiveTime: number;  // 最后激活时间戳（用于清理）
+  }
+  const sessionCacheRef = useRef<Map<string, CachedSession>>(new Map());
+
   // 版本发布相关
   const [latestVersion, setLatestVersion] = useState<LatestVersion | null>(null);
   const [latestVersionLoading, setLatestVersionLoading] = useState(false);
@@ -171,27 +179,25 @@ function AuthenticatedModelPlatformApp() {
       setScripts(items);
       setDirectories(folderItems);
       setApiOnline(true);
+      // 刷新时保留选中的文件，不自动选中第一个
       setSelectedId((current) => {
-        if (current && items.some((item) => item.script_id === current)) {
+        const validIds = new Set(items.map(item => item.script_id));
+        // 当前选中的文件还在 → 保持
+        if (current && validIds.has(current)) {
           selectedIdRef.current = current;
           return current;
         }
-        const nextSelectedId = (
-          items.find((item) => item.script_type === "notebook")?.script_id
-          ?? items[0]?.script_id
-          ?? null
-        );
-        selectedIdRef.current = nextSelectedId;
-        return nextSelectedId;
+        // 否则设为 null（不自动选中）
+        selectedIdRef.current = null;
+        return null;
       });
-      // 同时更新打开的标签页
+      // 同时更新打开的标签页：保留有效标签，移除已删除的文件
       setOpenTabIds((current) => {
-        const firstNotebook = items.find((item) => item.script_type === "notebook")?.script_id
-          ?? items[0]?.script_id;
-        if (!firstNotebook) return [];
-        // 如果当前标签页已经包含，则保持不变
-        if (current.includes(firstNotebook)) return current;
-        return [firstNotebook];
+        const validIds = new Set(items.map(item => item.script_id));
+        // 过滤掉已删除的文件
+        const preserved = current.filter(id => validIds.has(id));
+        // 直接返回（有就有，没有就没有，不自动补充）
+        return preserved;
       });
     } catch (error) {
       setApiOnline(false);
@@ -318,32 +324,76 @@ function AuthenticatedModelPlatformApp() {
     return () => window.clearInterval(timer);
   }, [editSession?.edit_session_id, editSession?.heartbeat_interval_seconds]);
 
-  // Jupyter 访问票据续签
+  // 统一心跳管理：为所有缓存的会话维持心跳（包括隐藏的 iframe）
   useEffect(() => {
-    if (!editSession?.ticket_expires_at) return;
-    const expiresAt = new Date(editSession.ticket_expires_at).getTime();
-    const renewAfter = Math.max(15_000, expiresAt - Date.now() - 60_000);
-    const timer = window.setTimeout(() => {
-      const current = editSessionRef.current;
-      if (!current || current.edit_session_id !== editSession.edit_session_id) {
-        return;
+    const intervalSeconds = 15;
+    let heartbeatRunning = false;
+    const timer = window.setInterval(() => {
+      if (heartbeatRunning) return;
+      heartbeatRunning = true;
+      // 为所有缓存的会话调用心跳
+      const promises: Promise<void>[] = [];
+      for (const cached of sessionCacheRef.current.values()) {
+        // 只更新缓存中的 session 对象，不更新 React 状态
+        promises.push(
+          api.heartbeatFileLock(cached.session)
+            .then((updated) => {
+              cached.session.session_status = updated.session_status;
+              cached.session.expires_at = updated.expires_at;
+            })
+            .catch(() => {
+              // 不删除缓存，等待用户切回来时再处理
+            })
+        );
       }
-      void api.createJupyterAccessTicket(current)
-        .then((ticket) => {
-          setEditSession((active) => active
-            && active.edit_session_id === ticket.edit_session_id
-            ? { ...active, ticket_expires_at: ticket.expires_at }
-            : active);
-        })
-        .catch((error) => {
-          setToast({
-            tone: "error",
-            message: `Jupyter 访问票据续签失败：${error instanceof Error ? error.message : "请重新打开文件"}`,
-          });
+      Promise.allSettled(promises).finally(() => {
+        heartbeatRunning = false;
+      });
+    }, intervalSeconds * 1000);
+    return () => window.clearInterval(timer);
+  }, []);
+
+  // 定时清理：10 分钟无活动的会话
+  useEffect(() => {
+    const TEN_MINUTES = 10 * 60 * 1000;
+    const CHECK_INTERVAL = 60 * 1000;  // 每分钟检查一次
+
+    const cleanupTimer = window.setInterval(() => {
+      const now = Date.now();
+      const toCleanup: string[] = [];
+
+      // 找出需要清理的会话
+      for (const [scriptId, cached] of sessionCacheRef.current.entries()) {
+        // 只清理非激活的会话
+        if (scriptId !== selectedIdRef.current) {
+          const inactiveTime = now - cached.lastActiveTime;
+          if (inactiveTime > TEN_MINUTES) {
+            toCleanup.push(scriptId);
+          }
+        }
+      }
+
+      // 执行清理
+      if (toCleanup.length > 0) {
+        for (const scriptId of toCleanup) {
+          const cached = sessionCacheRef.current.get(scriptId);
+          if (cached) {
+            // 释放编辑锁
+            api.releaseFileLock(cached.session).catch(console.warn);
+            // 从缓存删除
+            sessionCacheRef.current.delete(scriptId);
+          }
+        }
+        // 通知用户
+        setToast({
+          tone: "info",
+          message: `已清理 ${toCleanup.length} 个长时间未活动的编辑会话`,
         });
-    }, renewAfter);
-    return () => window.clearTimeout(timer);
-  }, [editSession?.edit_session_id, editSession?.ticket_expires_at]);
+      }
+    }, CHECK_INTERVAL);
+
+    return () => window.clearInterval(cleanupTimer);
+  }, []);
 
   // 页面卸载时释放编辑锁
   useEffect(() => {
@@ -390,16 +440,23 @@ function AuthenticatedModelPlatformApp() {
 
   // 关闭标签
   const closeTab = async (scriptId: string, event?: ReactMouseEvent) => {
+    console.log('[closeTab] 开始关闭:', scriptId, '当前 selectedId:', selectedId);
     event?.stopPropagation();
     if (editSessionRef.current?.script_id === scriptId) {
+      console.log('[closeTab] 需要结束编辑');
       await endEditing(false, false);
     }
+    // 从缓存中删除
+    sessionCacheRef.current.delete(scriptId);
     setOpenTabIds((current) => {
+      console.log('[closeTab] 当前标签栏:', current);
       const index = current.indexOf(scriptId);
       if (index === -1) return current;
       const newTabs = current.filter((id) => id !== scriptId);
+      console.log('[closeTab] 关闭后的标签栏:', newTabs);
       if (selectedId === scriptId) {
         const nextId = newTabs[index] ?? newTabs[index - 1] ?? null;
+        console.log('[closeTab] 选中下一个:', nextId);
         setSelectedId(nextId);
         selectedIdRef.current = nextId;
       }
@@ -407,7 +464,7 @@ function AuthenticatedModelPlatformApp() {
     });
   };
 
-  // 切换标签
+  // 切换标签 - 直接复用缓存的会话，不重新打开
   const switchTab = (scriptId: string) => {
     if (selectedIdRef.current !== scriptId) {
       editorOpenRequestRef.current += 1;
@@ -415,6 +472,15 @@ function AuthenticatedModelPlatformApp() {
     }
     setSelectedId(scriptId);
     selectedIdRef.current = scriptId;
+    // 如果有缓存的会话，直接切换
+    const cached = sessionCacheRef.current.get(scriptId);
+    if (cached) {
+      // 更新最后激活时间
+      cached.lastActiveTime = Date.now();
+      setEditSession(cached.session);
+      editSessionRef.current = cached.session;
+      setEmbeddedJupyterUrl(cached.jupyterUrl);
+    }
   };
 
   // 打开脚本编辑器
@@ -437,9 +503,28 @@ function AuthenticatedModelPlatformApp() {
     setEditBusy(true);
     setEditorOpenError((current) =>
       current?.scriptId === script.script_id ? null : current);
-    let active = editSessionRef.current;
-    let newlyAcquired = false;
+
     try {
+      // 检查是否已有缓存的编辑会话
+      const cached = sessionCacheRef.current.get(script.script_id);
+      if (cached) {
+        if (!requestIsCurrent()) return;
+        // 直接复用缓存的会话和 URL
+        setEditSession(cached.session);
+        editSessionRef.current = cached.session;
+        setEmbeddedJupyterUrl(cached.jupyterUrl);
+        if (showToast) {
+          setToast({
+            tone: "success",
+            message: `${script.script_name} 已打开，Jupyter 已嵌入当前工作区`,
+          });
+        }
+        return;
+      }
+
+      // 没有缓存，需要获取新锁
+      let active = editSessionRef.current;
+      let newlyAcquired = false;
       if (active && active.script_id !== script.script_id) {
         await api.releaseFileLock(active);
         setEmbeddedJupyterUrl(null);
@@ -463,8 +548,10 @@ function AuthenticatedModelPlatformApp() {
 
       const ticket = await api.createJupyterAccessTicket(active);
       if (!requestIsCurrent()) {
-        await api.releaseFileLock(active);
-        clearSessionIfActive(active);
+        if (newlyAcquired) {
+          await api.releaseFileLock(active);
+          clearSessionIfActive(active);
+        }
         return;
       }
 
@@ -472,6 +559,12 @@ function AuthenticatedModelPlatformApp() {
       setEditSession(readySession);
       editSessionRef.current = readySession;
       setEmbeddedJupyterUrl(ticket.jupyter_url);
+      // 缓存会话（多 iframe 方案：增加 lastActiveTime）
+      sessionCacheRef.current.set(script.script_id, {
+        session: readySession,
+        jupyterUrl: ticket.jupyter_url,
+        lastActiveTime: Date.now(),
+      });
       if (showToast) {
         setToast({
           tone: "success",
@@ -479,15 +572,6 @@ function AuthenticatedModelPlatformApp() {
         });
       }
     } catch (error) {
-      if (newlyAcquired && active) {
-        try {
-          await api.releaseFileLock(active);
-        } catch {
-          // The database lease is the final safety net
-        }
-        setEditSession(null);
-        editSessionRef.current = null;
-      }
       setEmbeddedJupyterUrl(null);
       if (requestIsCurrent()) {
         const message = error instanceof Error ? error.message : "打开编辑器失败";
@@ -514,6 +598,14 @@ function AuthenticatedModelPlatformApp() {
     ) {
       return;
     }
+    // 检查是否有缓存的会话，有则直接复用，不触发自动打开
+    const cached = sessionCacheRef.current.get(selected.script_id);
+    if (cached) {
+      setEditSession(cached.session);
+      editSessionRef.current = cached.session;
+      setEmbeddedJupyterUrl(cached.jupyterUrl);
+      return;
+    }
     void openScriptEditor(selected, false);
   }, [
     activePage, editBusy, editSession?.script_id, editorOpenError?.scriptId,
@@ -538,6 +630,8 @@ function AuthenticatedModelPlatformApp() {
       setEmbeddedJupyterUrl(null);
       setEditSession(null);
       editSessionRef.current = null;
+      // 从缓存中删除
+      if (scriptId) sessionCacheRef.current.delete(scriptId);
       if (closeTabFlag && scriptId) {
         void closeTab(scriptId);
       }
@@ -557,21 +651,6 @@ function AuthenticatedModelPlatformApp() {
     }
   };
 
-  // 切换文件时结束编辑
-  useEffect(() => {
-    const active = editSessionRef.current;
-    if (
-      !active
-      || !selected
-      || selected.script_type === "notebook"
-      || selected.script_id === active.script_id
-      || editBusy
-    ) {
-      return;
-    }
-    void endEditing(false, false);
-  }, [editBusy, selected?.script_id, selected?.script_type]);
-
   // 切换页面时结束编辑
   useEffect(() => {
     if (
@@ -682,7 +761,10 @@ function AuthenticatedModelPlatformApp() {
         lastCreated = await api.uploadScript(file, uploadParentPath);
       }
       await load(true);
-      if (lastCreated) selectScript(lastCreated.script_id);
+      if (lastCreated) {
+        openTab(lastCreated.script_id);
+        selectScript(lastCreated.script_id);
+      }
       setToast({
         tone: "success",
         message: `${files.length} 个文件已上传到${uploadParentPath ? ` ${uploadParentPath}` : "当前目录"}`,
@@ -729,7 +811,18 @@ function AuthenticatedModelPlatformApp() {
     }
     try {
       await api.deleteScript(script.script_id);
-      if (selectedIdRef.current === script.script_id) selectScript(null);
+      // 从标签栏删除该文件，并选中相邻的文件
+      setOpenTabIds((current) => {
+        const index = current.indexOf(script.script_id);
+        const newTabs = current.filter((id) => id !== script.script_id);
+        // 如果删除的是当前选中的文件，选中相邻的
+        if (selectedIdRef.current === script.script_id) {
+          const nextId = newTabs[index] ?? newTabs[index - 1] ?? null;
+          setSelectedId(nextId);
+          selectedIdRef.current = nextId;
+        }
+        return newTabs;
+      });
       await load(true);
       setToast({ tone: "success", message: `${script.script_name} 已删除` });
     } catch (error) {
@@ -842,10 +935,10 @@ function AuthenticatedModelPlatformApp() {
             <section className="editor-area">
               {selected ? (
                 <ScriptWorkspace
-                  key={selected.script_id}
                   script={selected}
-                  editSession={editSession?.script_id === selected.script_id ? editSession : null}
-                  jupyterUrl={editSession?.script_id === selected.script_id ? embeddedJupyterUrl : null}
+                  sessionCache={sessionCacheRef.current}
+                  editSession={editSession}
+                  jupyterUrl={embeddedJupyterUrl}
                   editBusy={editBusy}
                   openError={editorOpenError?.scriptId === selected.script_id ? editorOpenError.message : null}
                   latestVersion={latestVersion}
diff --git a/frontend/app/features/platform/ScriptWorkspace.tsx b/frontend/app/features/platform/ScriptWorkspace.tsx
index 9a792ab..cce6111 100644
--- a/frontend/app/features/platform/ScriptWorkspace.tsx
+++ b/frontend/app/features/platform/ScriptWorkspace.tsx
@@ -6,7 +6,7 @@ import type {
   ScriptType,
 } from "../../services/api";
 import { scriptIcon } from "./WorkspaceTree";
-import type { MouseEvent as ReactMouseEvent } from "react";
+import type { MouseEvent as ReactMouseEvent, RefObject } from "react";
 import { useRef, useEffect } from "react";
 
 type ToastState = {
@@ -14,8 +14,16 @@ type ToastState = {
   message: string;
 };
 
+// 缓存的会话类型（多 iframe 共存方案）
+interface CachedSession {
+  session: ActiveEditSession;
+  jupyterUrl: string;
+  lastActiveTime: number;
+}
+
 type ScriptWorkspaceProps = {
   script: ScriptItem;
+  sessionCache: Map<string, CachedSession>;
   editSession: ActiveEditSession | null;
   jupyterUrl: string | null;
   editBusy: boolean;
@@ -91,6 +99,7 @@ function confineJupyterFrame(frame: HTMLIFrameElement): void {
 
 export function ScriptWorkspace({
   script,
+  sessionCache,
   editSession,
   jupyterUrl,
   editBusy,
@@ -108,7 +117,9 @@ export function ScriptWorkspace({
 }: ScriptWorkspaceProps) {
   const tabbarRef = useRef<HTMLDivElement | null>(null);
   const isNotebook = script.script_type === "notebook";
-  const isEditing = editSession?.session_status === "active";
+  // 判断当前选中的文件是否正在编辑（需要同时检查 session_status 和 script_id）
+  const isEditing = editSession?.session_status === "active"
+                 && editSession?.script_id === script.script_id;
 
   const scroll = (direction: "left" | "right") => {
     const tabbar = tabbarRef.current;
@@ -232,64 +243,85 @@ export function ScriptWorkspace({
         </div>
       </div>
 
-      <div className={`editor-canvas${isEditing && jupyterUrl ? " is-embedded" : ""}`}>
-        {isEditing && jupyterUrl ? (
-          <section className="embedded-jupyter">
-            <div className="embedded-jupyter__status">
-              <span>
-                <i />
-                Workspace Jupyter Server
-              </span>
-              <span>
-                {isNotebook ? "Notebook Session · Python 3 Kernel" : "Jupyter 文本编辑器"}
-              </span>
-              <code title={editSession.runtime_id}>
-                Runtime {editSession.runtime_id.slice(-8)}
-              </code>
-            </div>
-            <iframe
-              key={`${editSession.edit_session_id}:${jupyterUrl}`}
-              src={jupyterUrl}
-              title={`${script.script_name} Jupyter 编辑器`}
-              allow="clipboard-read; clipboard-write"
-              sandbox="allow-same-origin allow-scripts allow-forms allow-downloads allow-modals"
-              onLoad={(event) => confineJupyterFrame(event.currentTarget)}
-            />
-          </section>
-        ) : isNotebook ? (
-          <section
-            className={`editor-opening-state${openError ? " has-error" : ""}`}
-            aria-live="polite"
-          >
-            <div className="editor-opening-state__icon">
-              {openError
-                ? <Icon name="info" size={28} />
-                : <span className="button-spinner button-spinner--blue" />}
-            </div>
-            <strong>
-              {openError ? "Notebook 打开失败" : "正在打开 Notebook"}
-            </strong>
-            <p>
-              {openError
-                ? openError
-                : "正在获取编辑锁并连接 Workspace Jupyter Server…"}
-            </p>
-            {openError && (
-              <button
-                className="open-editor-button"
-                type="button"
-                disabled={editBusy}
-                onClick={onOpenEditor}
-              >
-                {editBusy
-                  ? <span className="button-spinner button-spinner--blue" />
-                  : <Icon name="refresh" size={16} />}
-                {editBusy ? "正在重试…" : "重试打开"}
-              </button>
-            )}
-          </section>
-        ) : (
-          <section className="script-overview">
+      {/* 多 iframe 共存方案：为每个缓存的 session 渲染独立的 iframe */}
+      <div className={`editor-canvas ${sessionCache.size > 0 ? 'is-embedded' : ''}`} style={sessionCache.size > 0 ? { position: 'relative', minHeight: '0', height: '100%' } : undefined}>
+        {/* 渲染所有缓存的 iframe */}
+        {Array.from(sessionCache.entries()).map(([scriptId, cached]) => {
+          // 当前选中的脚本就是激活的
+          const isActive = scriptId === script.script_id;
+          return (
+            <section
+              key={scriptId}
+              className="embedded-jupyter"
+              style={{
+                position: isActive ? 'relative' : 'absolute',
+                visibility: isActive ? 'visible' : 'hidden',
+                pointerEvents: isActive ? 'auto' : 'none',
+                width: '100%',
+                height: '100%',
+                overflow: 'hidden'
+              }}
+            >
+              <div className="embedded-jupyter__status">
+                <span>
+                  <i />
+                  Workspace Jupyter Server
+                </span>
+                <span>
+                  {cached.session.session_status === "active" ? "Notebook Session · Python 3 Kernel" : "Jupyter 文本编辑器"}
+                </span>
+                <code title={cached.session.runtime_id}>
+                  Runtime {cached.session.runtime_id.slice(-8)}
+                </code>
+              </div>
+              <iframe
+                src={cached.jupyterUrl}
+                title={`${scriptId} Jupyter 编辑器`}
+                allow="clipboard-read; clipboard-write"
+                sandbox="allow-same-origin allow-scripts allow-forms allow-downloads allow-modals"
+                onLoad={(event) => confineJupyterFrame(event.currentTarget)}
+              />
+            </section>
+          );
+        })}
+
+        {/* 当前脚本没有缓存时的状态显示 */}
+        {!sessionCache.has(script.script_id) ? (
+          isNotebook ? (
+            <section
+              className={`editor-opening-state${openError ? " has-error" : ""}`}
+              aria-live="polite"
+              style={{ display: 'block' }}
+            >
+              <div className="editor-opening-state__icon">
+                {openError
+                  ? <Icon name="info" size={28} />
+                  : <span className="button-spinner button-spinner--blue" />}
+              </div>
+              <strong>
+                {openError ? "Notebook 打开失败" : "正在打开 Notebook"}
+              </strong>
+              <p>
+                {openError
+                  ? openError
+                  : "正在获取编辑锁并连接 Workspace Jupyter Server…"}
+              </p>
+              {openError && (
+                <button
+                  className="open-editor-button"
+                  type="button"
+                  disabled={editBusy}
+                  onClick={onOpenEditor}
+                >
+                  {editBusy
+                    ? <span className="button-spinner button-spinner--blue" />
+                    : <Icon name="refresh" size={16} />}
+                  {editBusy ? "正在重试…" : "重试打开"}
+                </button>
+              )}
+            </section>
+          ) : (
+            <section className="script-overview">
             <div className="script-overview__header">
               <div>
                 <span className="section-kicker">PYTHON SCRIPT</span>
@@ -365,7 +397,7 @@ export function ScriptWorkspace({
               </span>
             </div>
           </section>
-        )}
+        )) : null}
       </div>
     </>
   );