Rewrite SAAC_DEPLOYMENT.md to lead with the two-domain model:
- Production (yourapp.<server>.domain.com) — updates on saac deploy
- Hot-reload (yourapp-hot.<server>.domain.com) — auto-rebuilds on git push
Added: recommended dev workflow (push → check hot → deploy to prod),
nodemon.json explanation, development cycle diagram, customization guide.
Updated Dockerfile and docker-compose.yml headers to explain which
container uses which file and reference nodemon.json.
