Add ElevenLabs TTS proxy and update agent voices

- TTS proxy at /api/v1/tts/{voice_id} — keeps API key server-side
- Elizabeth, Clara, and Titan voices assigned to 20 agents
- Agent pages use ElevenLabs with Web Speech API fallback

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: SilkWeb

api/config.py

@@ -28,6 +28,12 @@ class Settings(BaseSettings):
     api_key_prefix: str = "sw_live_"
     api_key_test_prefix: str = "sw_test_"
 
+    # ElevenLabs TTS
+    elevenlabs_api_key: str = Field(
+        default="",
+        description="ElevenLabs API key for text-to-speech",
+    )
+
     # OAuth
     google_client_id: str = Field(
         default="",

api/main.py

@@ -21,7 +21,7 @@
 from api.config import settings
 from api.middleware.rate_limit import RateLimitMiddleware
 from api.middleware.security import SecurityHeadersMiddleware
-from api.routers import agents, agents_proxy, auth, discovery, health, receipts, tasks
+from api.routers import agents, agents_proxy, auth, discovery, health, receipts, tasks, tts
 
 # Logging
 logging.basicConfig(
@@ -95,6 +95,7 @@ def create_app() -> FastAPI:
     app.include_router(tasks.router)
     app.include_router(receipts.router)
     app.include_router(agents_proxy.router)
+    app.include_router(tts.router)
 
     return app
 

api/routers/tts.py

@@ -0,0 +1,43 @@
+"""Text-to-Speech proxy — forwards requests to ElevenLabs with server-side API key."""
+
+import httpx
+from fastapi import APIRouter, Request, Response
+
+from api.config import settings
+
+router = APIRouter()
+
+ELEVENLABS_API = "https://api.elevenlabs.io/v1/text-to-speech"
+
+
+@router.post("/api/v1/tts/{voice_id}")
+async def tts_proxy(voice_id: str, request: Request):
+    """Proxy TTS requests to ElevenLabs without exposing the API key."""
+    api_key = getattr(settings, "elevenlabs_api_key", None)
+    if not api_key:
+        return Response(content="TTS not configured", status_code=503)
+
+    body = await request.body()
+
+    async with httpx.AsyncClient(timeout=30.0) as client:
+        try:
+            resp = await client.post(
+                f"{ELEVENLABS_API}/{voice_id}",
+                content=body,
+                headers={
+                    "Content-Type": "application/json",
+                    "xi-api-key": api_key,
+                    "Accept": "audio/mpeg",
+                },
+            )
+            return Response(
+                content=resp.content,
+                status_code=resp.status_code,
+                media_type="audio/mpeg",
+                headers={
+                    "Access-Control-Allow-Origin": "*",
+                    "Cache-Control": "public, max-age=86400",
+                },
+            )
+        except Exception:
+            return Response(content="TTS request failed", status_code=502)