[Question] maintain a long connection when forwarding Dubbo requests

### Question

dubbo请求转发时，如何保持长连接

现在请求通过shenyu的dubbo插件转发到后端服务时，每个请求都会进行一次nacos服务发现，连接后端服务，请求服务，断开后端服务，注销nacos记录等操作。
请问，如何让shenyu与后端服务的dubbo协议连接，保持长连接，而不是每次费时的执行那么多步骤。

How to maintain a long connection when forwarding Dubbo requests

Now when a request is forwarded to the backend service through Shenyu's Dubbo plugin, each request will undergo a NACOS service discovery, connect to the backend service, request service, disconnect the backend service, and cancel NACOS records.
May I ask how to connect Shenyu to the Dubbo protocol of the backend service, maintaining a long connection instead of taking so many time-consuming steps each time.

The issue concerns Shenyu's Dubbo plugin and its NACOS service-discovery flow, but names no files, tests, or entry points. Start by locating the Dubbo plugin's request and service-discovery handling, then verify how connections and NACOS registrations are created and released. Done means forwarding reuses a long-lived backend Dubbo connection without repeating those operations for every request.

Written by the indexing model from the issue text.