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/app/models/job.py

@@ -0,0 +1,29 @@
+from datetime import datetime, timezone
+from typing import Optional
+from sqlmodel import SQLModel, Field
+
+
+class JobStatus:
+    QUEUED = "queued"
+    TRANSCRIBING = "transcribing"
+    SUMMARIZING = "summarizing"
+    PROTOCOLLING = "protocolling"
+    EXPORTING = "exporting"
+    DONE = "done"
+    FAILED = "failed"
+
+
+class Job(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    filename: str
+    original_name: str
+    title: str = ""
+    status: str = JobStatus.QUEUED
+    progress: int = 0
+    error: str = ""
+    transcript_path: str = ""
+    summary_path: str = ""
+    protocol_path: str = ""
+    docx_path: str = ""
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))