Describe the bug
Due to changes in the official MCP Registry API standard, metadata definitions for MCP Server have been updated, leading to potential incompatible data structure changes.

So Nacos 3.0.1 has some incompatible changes in data storage. And design the api call is compatibled.

But The actual api has some incompatible for api call for old maintainer sdk:

1. list mcp server behavior.
2. get mcp server will lose version.
3. create and update server will lose version.

Expected behavior
old maintainer sdk also can used to nacos 3.0.1 server.

Actually behavior
some default behavior is incompatible.

How to Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See errors

Desktop (please complete the following information):

• OS: [e.g. Centos]
• Version [e.g. nacos-server 1.3.1, nacos-client 1.3.1]
• Module [e.g. naming/config]
• SDK [e.g. original, spring-cloud-alibaba-nacos, dubbo]

Additional context
Add any other context about the problem here.