Refactor: Use MCP registry API as source of truth (#492)

- Replace static github-mcp-registry.json with live API calls
- Fetch from https://api.mcp.github.com/v0.1/servers/ with pagination support
- Extract displayName from GitHub metadata for better matching
- Implement smart matching logic:
  * Case-insensitive comparison
  * Match against both displayName and full name
  * Strip common suffixes like -mcp-server for pattern matching
- Make build process async to support API calls
- Cache registry data to only hit API once per build run
- Remove obsolete github-mcp-registry.json file

Benefits:
- No more manual updates to registry data
- Always uses latest MCP registry information
- Improved server name matching resilience
- Successfully loads all 54 servers from registry

Author: aaronpowell