Update voice API configuration: Add Twilio TURN server support and enhance ICE server retrieval logic. Update environment example and settings to include Twilio credentials. Introduce comprehensive client integration documentation for voice API.

Implement WebRTC ICE server configuration: Add support for dynamic and static ICE server retrieval in voice services, update FastAPI app to initialize voice handler, and enhance voice route endpoints. Update frontend to fetch ICE servers for WebRTC connections. Add comprehensive client integration documentation for voice API.

FIrst Commit