Adds a lightweight HTTP token server (port 8080) alongside the voice
pipeline so web clients can obtain LiveKit access tokens without a
separate service. Adds fastapi and uvicorn to requirements. Adds
LIVEKIT_PUBLIC_URL env var (wss://voice.hobbs.farm) to docker-compose
so tokens carry the correct public WebSocket URL for browser clients.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>