fix: 使用正确的Webman Request方法获取协议

- 使用 request()->header('x-forwarded-proto') 替代 isSecure()
- 支持反向代理环境

backend/app/controller/AuthController.php

@@ -290,7 +290,8 @@ class AuthController extends BaseController
             if ($feishuApp->mobile_callback_url) {
                 $callbackUrl = $feishuApp->mobile_callback_url;
             } else {
-                $scheme = request()->isSecure() ? 'https' : 'http';
+                // 检查反向代理的协议头
+                $scheme = request()->header('x-forwarded-proto') ?? request()->header('x-scheme') ?? 'https';
                 $callbackUrl = $scheme . '://' . request()->host() . '/login/callback';
             }
             $redirectUri = urlencode($callbackUrl);

backend/app/service/ApprovalService.php

@@ -506,8 +506,10 @@ class ApprovalService
 
         // 如果没有配置，使用当前请求构建
         if (!$baseUrl) {
-            $scheme = request()->isSecure() ? 'https' : 'http';
-            $baseUrl = $scheme . '://' . request()->host();
+            // 检查反向代理的协议头
+            $scheme = request()->header('x-forwarded-proto') ?? request()->header('x-scheme') ?? 'https';
+            $host = request()->host();
+            $baseUrl = $scheme . '://' . $host;
         }
 
         // 统一使用审批详情页，不再跳转到具体业务模块的详情页