feat: Add MCP manifest for nitansde-nitan-mcp

[mcpm-registry-bot]

Summary

This PR adds a new MCP server manifest generated from the repository: https://github.com/nitansde/nitan-mcp

Changes

• Added new manifest JSON file in mcp-registry/servers/
• Manifest was automatically generated using the chatxiv.org API

Test plan

• Verify the generated JSON is valid
• Check that all required fields are present
• Validate installation instructions work correctly

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