[FEATURE] marketplace mcp metadata should support external mcp registry integration

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The ability to define mcp configuration in the plugin is great. However having hardcoded urls in multiple files across multiple repos will cause confusion and additional overhead. The urls should be provided by an mcp private registry instead.

Proposed Solution

Integrate marketplace metadata with mcp registry. It's ok to specify mcp servers in the marketplace metadata but the address should be a reference to a registry.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

MCP server integration

Use Case Example

Whenever creating plugin with skills and mcp dependencies, the mcp server address should come from my private mcp server via a reference

Additional Context

_No response_