docs: retire third-party server list in favor of MCP Registry
The Third-Party Servers section (Official Integrations + Community Servers) has been superseded by the MCP Registry at https://registry.modelcontextprotocol.io/. The README already carried a deprecation note and CONTRIBUTING.md froze new additions. This removes the list, updates CONTRIBUTING.md to describe the new state, and refreshes the readme-pr-check workflow's bot comment.
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