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/routers/system.py

@@ -14,7 +14,7 @@ from pydantic import BaseModel
 
 import httpx
 
-from config import GATEWAY_URL, HERMES_API_URL, LLAMA_SWAP_URL, MEM0_SERVICE_URL
+from config import GATEWAY_URL, HERMES_API_URL, LLAMA_SWAP_URL, MEM0_SERVICE_URL, VOICE_SERVICE_URL
 from services import backup as backup_svc
 from services.agent import agent_status
 from services.gateway import gateway_reachable
@@ -28,7 +28,7 @@ log = logging.getLogger(__name__)
 router = APIRouter(prefix="/api")
 
 # Nur diese User-Dienste dürfen neugestartet werden.
-ALLOWED_SERVICES = {"mission-control-2", "hermes-gateway", "hermes-webui"}
+ALLOWED_SERVICES = {"mission-control-2", "hermes-gateway", "hermes-webui", "mem0-service", "voice-service"}
 # Quelle für Self-Update (auf der Box ~/mission-control-v2).
 SOURCE_DIR = os.path.expanduser(os.environ.get("MC2_SOURCE_DIR", "~/mission-control-v2"))
 
@@ -45,6 +45,13 @@ def _mem0_reachable() -> bool:
         return False
 
 
+def _voice_reachable() -> bool:
+    try:
+        return httpx.get(f"{VOICE_SERVICE_URL}/health", timeout=2).status_code == 200
+    except Exception:
+        return False
+
+
 @router.get("/system/services")
 def services() -> dict:
     """Aggregierte Erreichbarkeit aller Stack-Dienste (für die Health-Anzeige)."""
@@ -57,6 +64,7 @@ def services() -> dict:
             {"name": "Hermes-Gateway", "url": HERMES_API_URL, "ok": a["gateway_reachable"]},
             {"name": "Hermes-Terminal", "url": a["terminal_url"], "ok": a["terminal_reachable"]},
             {"name": "Mem0 (Gedächtnis)", "url": MEM0_SERVICE_URL, "ok": _mem0_reachable()},
+            {"name": "Voice (STT/TTS)", "url": VOICE_SERVICE_URL, "ok": _voice_reachable()},
         ],
         "links": {
             "engine_ui": f"{LLAMA_SWAP_URL}/ui",