fix: 修复批量删除 undefined/失败问题（POST 替代 DELETE body）

- 批量删除改走 POST /users/batch-remove（稳定保证 body 可被 Express 解析），同时增强 DELETE /batch 兼容 query string 回退
- 前端 usersApi.batchRemove 改用 POST 请求；批量删除函数新增 ok 标志位校验 + ?? 0 防 undefined，catch 分支带前缀明确提示失败原因
- npm run build 通过

server/src/routes/users.ts

@@ -237,9 +237,13 @@ router.post('/batch', authMiddleware, (req: AuthRequest, res: Response) => {
 });
 
 router.delete('/batch', authMiddleware, (req: AuthRequest, res: Response) => {
-  const { ids } = req.body || {};
+  const ids = Array.isArray((req.body || {}).ids)
+    ? (req.body as any).ids
+    : Array.isArray((req.query || {}).ids)
+      ? [].concat((req.query as any).ids as any)
+      : null;
   if (!Array.isArray(ids) || ids.length === 0) {
-    return res.status(400).json({ error: '请选择要删除的部员' });
+    return res.status(400).json({ ok: false, error: '请选择要删除的部员' });
   }
   const db = getDb();
   const list: number[] = [];
@@ -248,7 +252,7 @@ router.delete('/batch', authMiddleware, (req: AuthRequest, res: Response) => {
     if (!isNaN(n) && n > 0 && !list.includes(n)) list.push(n);
   }
   if (list.length === 0) {
-    return res.status(400).json({ error: '请选择有效的部员' });
+    return res.status(400).json({ ok: false, error: '请选择有效的部员' });
   }
   try {
     db.execCompat('BEGIN');
@@ -263,7 +267,38 @@ router.delete('/batch', authMiddleware, (req: AuthRequest, res: Response) => {
     res.json({ ok: true, deleted: count, total: list.length });
   } catch (e: any) {
     try { db.execCompat('ROLLBACK'); } catch {}
-    res.status(500).json({ error: e?.message || '批量删除失败' });
+    res.status(500).json({ ok: false, error: e?.message || '批量删除失败' });
+  }
+});
+
+router.post('/batch-remove', authMiddleware, (req: AuthRequest, res: Response) => {
+  const { ids } = req.body || {};
+  if (!Array.isArray(ids) || ids.length === 0) {
+    return res.status(400).json({ ok: false, error: '请选择要删除的部员' });
+  }
+  const db = getDb();
+  const list: number[] = [];
+  for (const id of ids) {
+    const n = Number(id);
+    if (!isNaN(n) && n > 0 && !list.includes(n)) list.push(n);
+  }
+  if (list.length === 0) {
+    return res.status(400).json({ ok: false, error: '请选择有效的部员' });
+  }
+  try {
+    db.execCompat('BEGIN');
+    const del = db.prepareCompat('DELETE FROM users WHERE id = ?');
+    let count = 0;
+    for (const id of list) {
+      const r = del.run(id);
+      count += (r?.changes ?? 0);
+    }
+    db.execCompat('COMMIT');
+    db.save();
+    res.json({ ok: true, deleted: count, total: list.length });
+  } catch (e: any) {
+    try { db.execCompat('ROLLBACK'); } catch {}
+    res.status(500).json({ ok: false, error: e?.message || '批量删除失败' });
   }
 });