Add configurable TCP ports and hosts for web interface and inter-process communication

- Add network configuration settings: web_host, web_port, backend_host, backend_web_port, backend_worker_port
- Update web.py to use configurable host and port for Flask app
- Update backend.py to use configurable ports for socket servers
- Update worker processes to use configurable backend worker port
- Add network configuration section to admin panel
- Update command line arguments to accept network settings
- Maintain backward compatibility with default values