Add LLM connection settings and enhance error handling: Introduce new parameters for LLM connection timeout, retry attempts, and stall timeout in .env.example and settings.py. Update agent.py to log errors and session closures, and implement a watchdog for LLM stall detection in MetricsCollector.

implement core services and dependencies

implement main entry point for Open Voice Agent with CLI support for running FastAPI, Streamlit, or both. Enhance Streamlit UI for audio processing and integrate WebSocket communication. Update dependencies in pyproject.toml and remove requirements.txt.