fix #108 systemd service (docker compose), fix #109 pin postgres:16-alpine

muzick.service

@@ -1,15 +1,16 @@
 [Unit]
-Description=Muzick Music Player
-After=network.target
+Description=Muzick Music Player (Docker Compose)
+After=docker.service network.target
+Requires=docker.service
 
 [Service]
-Type=simple
+Type=oneshot
+RemainAfterExit=yes
 User=kami
-WorkingDirectory=/home/kami/apps/muzick/backend
-Environment=MUZICK_PROXY=socks5://127.0.0.1:10808
-ExecStart=/home/kami/apps/muzick/backend/venv/bin/uvicorn main:app --host 0.0.0.0 --port 5213
-Restart=on-failure
-RestartSec=5
+WorkingDirectory=/home/kami/apps/muzick
+ExecStart=/usr/bin/docker compose up -d
+ExecStop=/usr/bin/docker compose down
+Environment=COMPOSE_FILE=/home/kami/apps/muzick/docker-compose.yml
 
 [Install]
 WantedBy=multi-user.target