chore: add backups directory to docker-compose

- Included a volume mapping for the `./backups` directory in the docker-compose file to facilitate backup management.

docker-compose.yml

@@ -16,6 +16,7 @@ services:
       - sqlite_data:/app/data
       # Monter ta DB locale (décommente pour utiliser tes données locales)
       - ./prisma/dev.db:/app/data/prod.db
+      - ./backups:/app/backups
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:3000/api/health || exit 1"]