修复账号删除报错+添加批量删除功能

- 修复单个删除报错：删除账号前先删除关联的LoginTask（外键约束）
- 新增批量删除接口 DELETE /api/accounts/batch/delete
- 路由顺序：/batch/delete 在 /{account_id} 前注册避免路径冲突
- 前端添加批量删除按钮（带确认弹窗）
- 前端添加 batchDelete API

web/backend/routers/accounts.py

@@ -288,6 +288,34 @@ def list_tags(
     return [t[0] for t in tags if t[0]]
 
 
+@router.delete("/batch/delete")
+def batch_delete_accounts(
+    account_ids: str = Query(..., description="逗号分隔的账号ID"),
+    db: Session = Depends(get_db),
+    current: User = Depends(require_permission("account:delete")),
+):
+    """批量删除账号及其关联的登录任务。"""
+    if not account_ids:
+        raise HTTPException(status_code=400, detail="请指定账号ID")
+
+    ids = [int(x) for x in account_ids.split(",") if x.strip().isdigit()]
+    if not ids:
+        raise HTTPException(status_code=400, detail="无效的账号ID")
+
+    # 先删除关联的登录任务
+    db.query(LoginTask).filter(LoginTask.account_id.in_(ids)).delete(synchronize_session=False)
+
+    # 删除账号
+    deleted = db.query(Account).filter(Account.id.in_(ids)).delete(synchronize_session=False)
+
+    db.add(AuditLog(
+        user_id=current.id, username=current.username,
+        action="account:delete", target=f"批量删除{deleted}个账号"
+    ))
+    db.commit()
+    return {"message": f"已删除 {deleted} 个账号", "deleted": deleted, "success": True}
+
+
 @router.delete("/{account_id}")
 def delete_account(
     account_id: int,
@@ -298,6 +326,9 @@ def delete_account(
     if not acc:
         raise HTTPException(status_code=404, detail="账号不存在")
 
+    # 先删除关联的登录任务，避免外键约束失败
+    db.query(LoginTask).filter(LoginTask.account_id == account_id).delete(synchronize_session=False)
+
     db.add(AuditLog(user_id=current.id, username=current.username,
                     action="account:delete", target=acc.username))
     db.delete(acc)