Extending: New Service Type

To add a new service:

1. Create a template folder under templates/<service> with minimal runnable code + README (optional).
2. Update service choices in bin/lib/scaffold.js and the add command in bin/index.js.
3. Add a default port in defaultPorts map.
4. Add Dockerfile generation logic inside the service loop (match existing patterns).
5. Add compose entry fields if needed (environment variables, healthchecks in future).
6. Update docs & tests (tests/smoke.test.js) to include the new service.

Update default port maps and compose/Docker generation if needed.

Validate by scaffolding a test project and confirming:

• Dockerfile exists
• Port is unique / not colliding
• Service appears in summary table