Switch deploy script from Swarm to Docker Compose

Docker Swarm had persistent issues with network allocation on icek,
causing tasks to stay stuck in "Preparing" state. Docker Compose
works reliably for single-node deployments.

Changes:
- Use docker compose instead of docker stack
- Add --pull flag to force registry pulls (default: prefer local images)
- Remove swarm init logic (no longer needed)
- Update help text and output messages