Removed the full/restricted-extension, approved-numbers pool/whiptail,
messaging-extensions, and personal-DID-assignment prompts from the
installer. All four are already live-editable, no-restart-needed settings
the Security Dashboard's PSTN Trunk tab manages end to end — the CLI wall
of prompts (that then needed a full reinstall to change) just duplicated
that with more friction. Every extension now starts at internal tier (no
PSTN, no messaging) until granted via the dashboard. Kept: provider/DID
setup, concurrency caps, and the inbound ring-group (basic trunk wiring,
not a permission). Also updated the generated README and CLI summary to
match, and refreshed the stale "known gap" messaging section that predated
the dialplan enforcement built earlier this session.