- setBookingCustomFields: use bookings_update's own custom_fields array
(confirmed from the real legacy plugin code) instead of
instance_custom_fields_set, which was only ever proven for a different,
unrelated plugin
- online_checkin_complete is now a configurable per-hotel custom field
(online_checkin_complete_custom_field_id setting), not a bogus top-level
bookings_update field NewBook would silently ignore
- Fix field-name mismatches vs a real live NewBook booking response:
booking_arrival/departure/length, guest address (street/city/state/
postcode/country, not a single field), phone/mobile (in contact_details,
not top-level), and pickPrimaryGuest now checks primary_client (was
checking fields that don't exist in the real API)
- Bundle the standalone push extension into backend/extension-src/, add
GET /api/extension/download (zips on request via archiver) and a
download button on the Settings page
- Remove newbook_hotel_id — vestigial from the legacy system's multi-hotel
routing model, never actually reached NewBook's API, this stack is
single-hotel-per-deployment so there's nothing to route between
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>