Switch from RDAP to direct WHOIS protocol

Major changes:
- Replaced RDAP-based domain lookups with direct WHOIS protocol using node-whois
- Added special handling for .eu domains and other ccTLDs
- Improved WHOIS response parsing with better field detection
- Added support for different WHOIS server formats
- Removed API dependencies for domain lookups
- Updated documentation to reflect the new WHOIS implementation

Benefits:
- Better support for all TLDs including country-specific domains
- No rate limits or API keys required for domain lookups
- More reliable and direct access to domain information
- Improved error handling and data parsing

Author: vin-im