Add healthcheck to docker-compose

[fiddur]

Add Docker healthchecks to the services in docker-compose.yml to enable proper orchestration and monitoring of container health.

This would allow Docker to automatically restart unhealthy containers and provide better visibility into service status.

Suggested implementation:

• Add healthcheck for backend service (e.g., curl -f http://localhost:3000/status)
• Add healthcheck for web service (e.g., curl -f http://localhost:80/)
• Configure appropriate intervals, timeouts, and retry counts