feat(nginx): 添加文件服务接口的API路由配置

为/api/file/路径添加代理配置，使其能够正确转发请求到本地文件服务。保持与其他接口一致的请求头设置，确保请求信息完整传递。

nginx.conf

@@ -38,6 +38,19 @@ http {
             proxy_set_header Authorization $http_authorization;
             proxy_pass http://localhost:33333/file/;
         }
+        # ============================================
+        # 文件服务接口 (/file/*)
+        # ============================================
+        location /api/file/ {
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header Host $host;
+            proxy_set_header X-Forwarded-Proto $scheme;
+            proxy_set_header X-Forwarded-Host $host;
+            proxy_set_header X-Forwarded-Port $server_port;
+            proxy_set_header Authorization $http_authorization;
+            proxy_pass http://localhost:33333/file/;
+        }
 
         # ============================================
         # Story 相关接口 (/api/story/*)