Fix Docker volume mounts and database path for proper persistence

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   carplay-audio:
     build: .
@@ -10,13 +8,12 @@ services:
     volumes:
       # Mount your music library (change the left path to your music folder)
       - /Volumes/Data/Music:/data/music:ro
-      # Persistent data (database, artwork, config)
-      - ./data/artwork:/app/artwork
-      - ./data/database/audio_server.db:/app/audio_server.db
-      - ./data/database/config.json:/app/config.json
+      # Persistent data (database and artwork stored in data directory)
+      - ./data:/app/data
     environment:
       - NODE_ENV=production
       - PORT=4000
+      - DB_PATH=/app/data/audio_server.db
     healthcheck:
       test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:4000/health"]
       interval: 30s