fix: 移除硬编码的开发环境域名

- 使用动态域名配置（从 request 或 config 读取）
- 添加 FEISHU_BASE_URL 环境变量支持
- 修复回调地址为当前站点域名

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

backend/app/controller/AuthController.php

@@ -287,7 +287,8 @@ class AuthController extends BaseController
             ]);
 
             // 构建扫码登录 URL
-            $redirectUri = urlencode("https://xsm.dev.hnxinyouhe.com/login/callback");
+            $baseUrl = config('feishu_notification.base_url') ?? request()->scheme() . '://' . request()->host();
+            $redirectUri = urlencode($baseUrl . '/login/callback');
             $authUrl = "https://passport.feishu.cn/suite/passport/oauth/authorize?client_id={$feishuApp->app_id}&redirect_uri={$redirectUri}&response_type=code&state={$loginSession->id}";
 
             error_log("✅ 生成二维码会话: session_id={$loginSession->id}");