- Introduced `.env.example` for environment variable configuration.
- Updated `docker-compose.yml` to utilize environment variables for proxy settings.
- Implemented proxy authentication with Basic Auth and geo-blocking based on country codes.
- Added `GEO_FILTER.md` for documentation on geo-filtering configuration.
- Enhanced logging to indicate authentication status and blocked countries during proxy server startup.
Set default WebUI password to "proxygo" and allow customization via
WEBUI_PASSWORD environment variable, eliminating the need to manually
compute SHA256 hashes and modify source code.