Add support for two new standalone site content modules in the admin dashboard:
hotel groups and vehicle options. This commit includes:
- Added TypeScript types for HotelGroup and VehicleOption, extended SiteConfig and SiteModule enum
- Updated admin utilities (primary key lookup, empty drafts, payload compaction) for the new modules
- Added management UI panels and editors in the structure page for configuring the new modules
- Adjusted module rail styling and interactive states for consistent UI across the admin
- Updated ctaBanners type definition to include missing sortOrder, createdAt, and updatedAt fields
- Updated API and admin documentation to cover the new modules' CRUD endpoints and field contracts
86a12dd1a0