fix: correct volume mount path for database persistence

The container runs from / so data/games.db resolves to /data/games.db,
but the volume was mounted at /app/data.

docker-compose.yml

@@ -11,4 +11,4 @@ services:
     environment:
       - PORT=8080
     volumes:
-      - ./data:/app/data
+      - ./data:/data