feat: add A-card operations frontend and backend foundation

frontend/app/components/common/Topbar.tsx

@@ -24,10 +24,16 @@ export function Topbar({
   onSetCurrentWorkspace,
   onLogout,
 }: TopbarProps) {
+  const roleLabel = user?.is_system_admin || user?.role_code === "admin"
+    ? "管理员"
+    : ["business", "business_team", "biz"].includes(user?.role_code ?? "")
+      ? "业务团队"
+      : "模型团队";
   const pageTitles: Record<string, string> = {
     home: "工作台",
     scripts: "构建脚本",
     schedules: "调度配置",
+    operations: "A卡模型运维",
     system: "系统管理",
   };
 
@@ -124,7 +130,7 @@ export function Topbar({
                 {user?.display_name ?? "未知用户"}
               </strong>
               <small className="text-[10px] text-[#97a3b1]">
-                {user?.role_code === "admin" ? "管理员" : "开发人员"}
+                {roleLabel}
               </small>
             </span>
           </button>