{"service":"wecom-bridge","endpoints":{"GET /healthz":"健康检查","POST /notify":"下发一条企业微信应用消息（请求头 x-notify-token）","GET|POST /wecom/callback":"企业微信「接收消息」回调（带 msg_signature 时任何路径都算）"},"body":{"type":"markdown | text | textcard，默认 text","title":"textcard 必填","content":"markdown / text 的正文；textcard 的描述","url":"textcard 点击跳转链接（可选）","btnText":"textcard 按钮文案，默认「详情」","touser":"接收人 userid 或 @all，默认 @all","source":"调用方标识，只用于日志"}}