Sync docker-compose.staging.yml with server

- Share production uploads directory for staging
- Ensures image files are available in staging environment

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.staging.yml

@@ -26,7 +26,7 @@ services:
     env_file:
       - ./backend/.env
     volumes:
-      - /opt/autonet/staging/backend/uploads:/app/uploads
+      - /opt/autonet/production/backend/uploads:/app/uploads
     restart: unless-stopped
     networks:
       - mongolcar-network