feat: voice-agent MVP — LXC web frontend + Mac AI worker

LXC-Frontend (FastAPI + HTML/JS):
- Audio-Upload (MP3/WAV/M4A/MP4/OGG/FLAC, max. 500 MB)
- SQLite Job-Store, BackgroundTask-Pipeline
- Job-Liste mit Live-Status, Downloads (DOCX + JSON)
- Mac-Health-Indicator im UI

Mac-Worker (FastAPI):
- /api/transcribe (lightning-whisper-mlx | faster-whisper | mock)
- /api/summarize + /api/protocol via Ollama (llama3.1:8b)
- /api/export/docx via python-docx

Deploy:
- systemd-Service, Nginx Reverse-Proxy
- deploy/install.sh: idempotentes LXC-Setup

Doku: README.md, lxc-frontend/README.md, mac-worker/README.md

lxc-frontend/.env.example

@@ -0,0 +1,17 @@
+# LXC-Frontend Konfiguration
+APP_NAME="Voice-Agent"
+APP_HOST=0.0.0.0
+APP_PORT=8000
+
+# Verzeichnisse (werden bei Start angelegt)
+UPLOAD_DIR=/var/lib/voice-agent/uploads
+RESULT_DIR=/var/lib/voice-agent/results
+DB_URL=sqlite:////var/lib/voice-agent/voice-agent.db
+
+# Mac-Worker API (im LAN erreichbar)
+MAC_API_URL=http://192.168.85.10:8080
+MAC_API_TIMEOUT=1800
+
+# Limits
+MAX_UPLOAD_MB=500
+ALLOWED_EXTS=mp3,wav,m4a,mp4,ogg,flac