feat: batch delete

static/batch.js

@@ -1,9 +1,9 @@
 'use strict';
 
 // ---------------------------------------------------------------------------
-// 批量选择 / 批量下载 (依赖 app.js 的 consts: checkAll, checkAllWrap,
-// batchBtn, batchCount, filesList, toast)
-// 用 var 顶层声明, 与 app.js 同 <script> 内共享 (loadFiles / fileRow 读写).
+// 批量选择 / 批量下载 / 批量删除 (依赖 app.js 的 consts: checkAll, checkAllWrap,
+// batchBtn, batchCount, batchDeleteBtn, batchDeleteCount, filesList, toast)
+// 用 var 顶层声明, 跨文件共享 (classic <script> 加载顺序: app.js → helpers.js → batch.js).
 // ---------------------------------------------------------------------------
 var selectedFiles = new Set();
 
@@ -17,6 +17,8 @@ function updateBatchUI() {
   const n = selectedFiles.size;
   batchCount.textContent = n;
   batchBtn.style.display = n > 0 ? 'inline-block' : 'none';
+  batchDeleteCount.textContent = n;
+  batchDeleteBtn.style.display = n > 0 ? 'inline-block' : 'none';
 
   const checks = filesList.querySelectorAll('.file-check');
   if (checks.length === 0) {
@@ -81,8 +83,37 @@ batchBtn.addEventListener('click', async () => {
   }
 });
 
+batchDeleteBtn.addEventListener('click', async () => {
+  if (selectedFiles.size === 0) return;
+  const names = [...selectedFiles];
+  if (!confirm(`确定删除选中的 ${names.length} 个文件吗? 该操作不可恢复.`)) return;
+  batchDeleteBtn.disabled = true;
+  const restore = () => { batchDeleteBtn.disabled = false; batchDeleteBtn.textContent = `批量删除 (${selectedFiles.size})`; };
+  batchDeleteBtn.textContent = '删除中...';
+  try {
+    const r = await fetch('/files-delete', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ files: names }),
+    });
+    if (!r.ok) {
+      let msg = 'HTTP ' + r.status;
+      try { msg = (await r.json()).error || msg; } catch {}
+      throw new Error(msg);
+    }
+    const data = await r.json();
+    toast(`已删除 ${data.deleted} 个文件`, 'success');
+    selectedFiles.clear();
+    await loadFiles();
+  } catch (e) {
+    toast('批量删除失败: ' + e.message, 'error');
+  } finally {
+    restore();
+  }
+});
+
 // ---------------------------------------------------------------------------
 // Boot (从 app.js 末尾移过来, 确保 selectedFiles 已声明再启动首次 loadFiles)
 // ---------------------------------------------------------------------------
 loadFiles();
-setInterval(loadFiles, 30000);
+setInterval(loadFiles, 30000);