Add freight demo data seeder and permissions management

- Introduced `DemoFreightDataSeeder` to seed demo freight data including wagons, approval rules, and staff users.
- Added `seed:freight-demo` script to `package.json` for easy execution.
- Updated permissions for operations officer and added permission checks in various components.
- Enhanced sidebar and booking actions to respect user permissions.

apps/edr-freight-web/backoffice/src/features/bookings/booking-actions.config.ts

@@ -201,6 +201,7 @@ const ACTION_PERMISSION: Partial<Record<BookingActionId, string>> = {
   signContractStaff: FREIGHT_PERMS.bookings.signStaff,
   startTransit: FREIGHT_PERMS.bookings.operations,
   complete: FREIGHT_PERMS.bookings.operations,
+  allocateBooking: FREIGHT_PERMS.trainScheduling.manage,
   cancel: FREIGHT_PERMS.bookings.cancel,
 };