This commit adds the complete admin workflow for managing homepage curated route subgroups:
- Add `RouteSection` type and extend `SiteConfig`/`SiteModule` to support the new module
- Create all required admin components: panel, editors, product picker, and utility functions
- Update admin utilities and API types to handle routeSections CRUD operations
- Update documentation to include the new routeSections API contract
- Add supporting CSS styles for the new UI elements
- Updated styles in src/styles.css for better responsiveness and layout adjustments.
- Added new CSS classes for edit drawer and item rail components.
- Introduced animations for drawer transitions.
- Created new types in src/types/admin.ts for better type safety in admin features.
- Modified vite.config.ts to change server port and enable strict port settings for development.
