Add UnifAPI MCP server

[desenmeng]

Summary

Adds UnifAPI MCP Server to the mcpserver.works data source.

Details

• Adds a YAML metadata entry under data/unifapi-mcp-server/.
• Adds the matching Markdown description file.
• Includes the hosted MCP endpoint https://mcp.unifapi.com, repository URL, category, tags, and logo URL.

Validation

• Parsed the YAML with Ruby YAML.load_file.
• Ran git diff --check.
• Verified the repository URL and logo URL return HTTP 200.
• Verified the MCP endpoint returns the expected unauthenticated OAuth challenge.