refactor: restrict mcp_catalog to oauth and none auth only#2988
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The MCP catalog feature currently requires manual API key management for 12 of its 51 servers. Most users don't need these, and their configuration overhead adds unnecessary complexity. This change simplifies the catalog by supporting only OAuth and anonymous-access servers, which can be fully managed by the framework.
The refactor removes all API key machinery from the MCP catalog code, drops 12 rarely-used servers from the built-in registry, and updates callers and tests accordingly. The catalog shrinks from 51 to 39 servers but becomes much simpler to use and maintain. Users who need the removed servers can still set them up manually as custom MCP servers.
The change is backwards-incompatible for anyone explicitly using the removed servers in their config, but as an internal feature not yet documented in release notes, this is acceptable.