Feat: Sprechen-Tab — mit Hermes per Sprache reden (Browser-Voice + 3D-Avatar)

Voll-Duplex Sprach-Interaktion vom lokalen PC mit dem vollen Hermes-Agenten
(api_server :8642, OpenAI-kompatibel → gleiche Tools + geteiltes Mem0 wie CLI/Telegram).

- Voice-Sidecar (voice_service/, eigenes Py3.12-venv ~/.voice, :8650): STT faster-whisper
  (medium, de) + gestuftes TTS — Piper (schnell, Default) + Chatterbox (premium, Voice-Cloning,
  lazy-load, CPU-Start). Analog mem0_service.
- Backend: routers/voice.py (Proxy /api/voice/stt|tts|voices + /chat-SSE an Hermes mit
  Bearer API_SERVER_KEY + X-Hermes-Session-Id für server-seitigen Verlauf). config.py:
  VOICE_SERVICE_URL + HERMES_API_KEY (Fallback aus ~/.hermes/.env). System-Dienstliste +
  Wartung (Restart/Logs) um voice-service ergänzt.
- Frontend: Sprechen-Tab mit 3D-Avatar (VRM via three-vrm) — Lippensync (Web-Audio-Pegel),
  Blinzeln, Sentiment-Mimik, Ruhepose. Avatar-Picker (CORS-freie Galerie + .vrm-Upload + URL
  + VRoid-Hub-Link) + Stimm-Auswahl. Push-to-talk (Knopf/Leertaste). Deps: three, r3f, drei.
- Deploy: deploy/voice-service.service + deploy.sh (idempotenter Sidecar-Install, enable, restart).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app.py

@@ -18,7 +18,7 @@ from fastapi.staticfiles import StaticFiles
 from starlette.requests import Request
 
 from config import FRONTEND_DIST, VERSION
-from routers import agent, connect, gateway_proxy, health, maintenance, memory, models, routing, system
+from routers import agent, connect, gateway_proxy, health, maintenance, memory, models, routing, system, voice
 from services import warmer
 
 # Zentrales Logging — Level via MC_LOG_LEVEL (INFO default). Eine Konfiguration
@@ -68,6 +68,7 @@ app.include_router(system.router)
 app.include_router(connect.router)
 app.include_router(memory.router)
 app.include_router(agent.router)
+app.include_router(voice.router)  # Sprache: STT/TTS-Proxy + Hermes-Agent-Chat (Voice-Tab)
 app.include_router(gateway_proxy.router)  # OpenAI-kompatibler /v1-Gateway (model:auto)
 app.include_router(maintenance.router)