{"service":"wechat-user-callback","version":"zb2-test","description":"微信网站应用OAuth回调处理服务 - 测试版本","endpoints":["/auth/wechat/callback - 回调处理（返回HTML）","/health - 健康检查","/ - 服务信息"],"features":["无数据库依赖","纯HTML返回","包含调试信息","postMessage通信"],"test_urls":["https://your-domain/auth/wechat/callback?code=TEST123&state=v4_123","https://your-domain/auth/wechat/callback?state=v4_456 (无code，测试失败场景)"]}