fix: 添加数据库初始化到AuthController

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/controller/AuthController.php

@@ -4,6 +4,7 @@ namespace app\controller;
 
 use app\service\FeishuService;
 use app\util\JwtUtil;
+use app\util\Db;
 use app\model\User;
 use app\model\Company;
 use Webman\Http\Request;
@@ -11,6 +12,11 @@ use Webman\Http\Response;
 
 class AuthController extends BaseController
 {
+    public function __construct()
+    {
+        Db::init();
+    }
+
     /**
      * 用户登录
      */