Add MaxStat MCP server

[fbmdata]

Summary

Adds the official remote MaxStat MCP server to the ToolHive catalog.

• Remote Streamable HTTP endpoint: https://maxstat.ru/api/mcp
• Authentication: required X-API-Token header
• Project page: https://maxstat.ru/promo/mcp
• Source and manifests: https://github.com/fbmdata/maxstat-mcp
• Official MCP Registry name: io.github.fbmdata/maxstat-mcp

MaxStat provides analytics for 408K+ MAX channels and 86M+ posts through 21 MCP tools.

[rdimitrov]

Hey @fbmdata, thanks for the submission. Several required pieces are missing: the entry uses the io.github.fbmdata namespace where every catalog entry uses io.github.stacklok/, there is no icons field or icon.svg file in the server directory, and the _meta block is missing the required overview and tools. The linked repo also has no server implementation, just packaging metadata and one integration test, which our criteria call out specifically. The X-API-Token header is declared correctly, so that part is fine.