fix: power outage auto-recovery improvements

Mosquitto:
- Change restart: always (was unless-stopped) to survive daemon restarts
- Add healthcheck (pub/sub ping) for depends_on conditions
- All downstream services use condition: service_healthy

Party-lock:
- Add MQTT connection retry loop (was crashing on DNS race after restart)

Zigbee2mqtt:
- Add entrypoint wrapper that auto-applies BLZ bridge patch at startup
- Bridge patch no longer needs manual 'just z2m-patch-bridge' after image pulls

Mopidy:
- Add python3-gi + python3-gi-cairo via apt (fixes 'No module named gi')
- Set PYTHONPATH to expose system gi module to Python 3.12

infra/party-lock/party-lock.py

@@ -51,7 +51,13 @@ def main():
     rebuild_acl()
     client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
     client.on_message = on_message
-    client.connect(MQTT_HOST, MQTT_PORT, 60)
+    while True:
+        try:
+            client.connect(MQTT_HOST, MQTT_PORT, 60)
+            break
+        except Exception as e:
+            print(f"mqtt connect failed: {e}; retrying in 5s", flush=True)
+            time.sleep(5)
     client.subscribe("party-lock/set", qos=1)
     client.loop_forever()