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

.gitignore

@@ -1,11 +1,31 @@
+# Toolkit / Projekt-Konfig
+config/project.env
+
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+venv/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# App-Daten
+.env
+*.sqlite
+*.sqlite3
+*.db
+
+# Node (Toolkit)
 node_modules/
 dist/
 build/
-.env
-config/project.env
-*.log
-.DS_Store
 coverage/
 .nyc_output/
+
+# Sonstiges
+*.log
+.DS_Store
 *.pem
 *.key