dev: overhaul SageTeaDeveloper.sh
- 19-item menu (Bootstrap #1), sudo auto-escalation
- Create portal: DLCX copied to /home//dlcx, plaintext DB pass in portal.conf
- Systemd uses /usr/bin/squeak + concrete SageTea-Server image
- List portals, Smoke test, Git bootstrap, .deb builder
- Paths default to repo structure under sagetea-factory/