feat: add rooms + bookings commands, separate events from bookings sync

CLI:
- chb rooms — list rooms with capacity, EUR/h, CHT/h, calendar status
- chb bookings [-n] [--skip] [--date] [--room] — list room bookings
- chb bookings sync [--room] [--force] [--since] — sync Google Calendar ICS
- chb events sync now only fetches Luma (ICS + API), no room calendars

fetch-calendars.ts:
- New fetchEventCalendars() — Luma ICS + API only
- New fetchBookingCalendars() — room Google Calendar ICS only
- fetchCalendars() still does both (backward compat)

fetch-recent.js: added separate bookings sync step

Author: xbot