feat: add FastAPI token server to pipecat-agent

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>

pipecat-agent/main.py

@@ -1,12 +1,16 @@
 """
 Entry point for the Pipecat VoiceCoach agent.
-Reads config from environment variables.
+Runs both the token HTTP server (for web clients) and the voice pipeline.
 """
 import asyncio
 import logging
 import os
+import threading
 
 import structlog
+import uvicorn
+from fastapi import FastAPI
+from pydantic import BaseModel
 from livekit import api as livekit_api
 
 from pipeline import run_voice_coach_pipeline
@@ -14,15 +18,59 @@ from pipeline import run_voice_coach_pipeline
 logging.basicConfig(level=logging.INFO)
 logger = structlog.get_logger()
 
+LIVEKIT_API_KEY = os.environ["LIVEKIT_API_KEY"]
+LIVEKIT_API_SECRET = os.environ["LIVEKIT_API_SECRET"]
+LIVEKIT_WS_URL = os.getenv("LIVEKIT_URL", "ws://livekit-server:7880")
+LIVEKIT_PUBLIC_URL = os.getenv("LIVEKIT_PUBLIC_URL", "wss://voice.hobbs.farm")
+
+# --- Token HTTP server (serves /token for web clients) ---
+
+token_app = FastAPI(title="VoiceCoach Token Service")
+
+
+class TokenRequest(BaseModel):
+    identity: str = "jeremy"
+
+
+class TokenResponse(BaseModel):
+    token: str
+    url: str
+
+
+@token_app.get("/health")
+async def health():
+    return {"status": "ok"}
+
+
+@token_app.post("/token")
+async def get_token(req: TokenRequest):
+    token = livekit_api.AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET)
+    token.with_grants(livekit_api.VideoGrants(
+        room_join=True,
+        room="voicecoach",
+        can_publish=True,
+        can_subscribe=True,
+    ))
+    token.identity = req.identity
+    return TokenResponse(token=token.to_jwt(), url=LIVEKIT_PUBLIC_URL)
+
+
+def run_token_server():
+    uvicorn.run(token_app, host="0.0.0.0", port=8080, log_level="info")
+
+
+# --- Main pipeline ---
 
 async def main():
     anthropic_key = os.environ["ANTHROPIC_API_KEY"]
-    livekit_api_key = os.environ["LIVEKIT_API_KEY"]
-    livekit_api_secret = os.environ["LIVEKIT_API_SECRET"]
-    livekit_url = os.getenv("LIVEKIT_URL", "ws://livekit-server:7880")
 
-    # Generate LiveKit access token for this agent
-    token = livekit_api.AccessToken(livekit_api_key, livekit_api_secret)
+    # Start token server in a background thread
+    server_thread = threading.Thread(target=run_token_server, daemon=True)
+    server_thread.start()
+    logger.info("Token server started on :8080")
+
+    # Generate agent's own LiveKit token
+    token = livekit_api.AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET)
     token.with_grants(livekit_api.VideoGrants(room_join=True, room="voicecoach"))
     token.identity = "voicecoach-agent"
     livekit_token = token.to_jwt()
@@ -33,9 +81,9 @@ async def main():
         "current_mode": "coaching mode",
     }
 
-    logger.info("Starting VoiceCoach pipeline", livekit_url=livekit_url)
+    logger.info("Starting VoiceCoach pipeline", livekit_url=LIVEKIT_WS_URL)
     await run_voice_coach_pipeline(
-        livekit_url=livekit_url,
+        livekit_url=LIVEKIT_WS_URL,
         livekit_token=livekit_token,
         anthropic_key=anthropic_key,
         session_context=session_context,