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>

frontend/src/nav.ts

@@ -6,10 +6,11 @@ import {
   Bot,
   TerminalSquare,
   HelpCircle,
+  Mic,
   type LucideIcon,
 } from "lucide-react"
 
-export type ViewId = "dashboard" | "models" | "memory" | "connect" | "agent" | "terminal" | "guide"
+export type ViewId = "dashboard" | "models" | "memory" | "connect" | "agent" | "terminal" | "voice" | "guide"
 
 export interface NavItem {
   id: ViewId
@@ -26,6 +27,7 @@ export const NAV: NavItem[] = [
   { id: "connect", label: "Verbinden", hint: "IDE-/Agent-Configs erzeugen", icon: Plug },
   { id: "agent", label: "Hermes", hint: "Agent-Status & Verdrahtung", icon: Bot },
   { id: "terminal", label: "Terminal", hint: "Interaktives Hermes-Agent-Terminal", icon: TerminalSquare },
+  { id: "voice", label: "Sprechen", hint: "Mit Hermes per Sprache reden (3D-Avatar)", icon: Mic },
   { id: "guide", label: "Anleitung", hint: "Einrichten & Vibe-Coding", icon: HelpCircle },
 ]