feat: implement 20ft container weight-pairing validation

- Added ContainerValidationService to handle 20ft weight-pairing logic.
- Introduced validate20ftWeightPairing utility function to check weight differences.
- Updated BookingPricingService to include overweight line details and pairing errors in price response.
- Enhanced BookingTransitionService to reject submissions with unpairable 20ft containers.
- Created ShipmentValidation interface for pre-submit validation of container contracts.
- Integrated shipment validation into the contract booking process, providing warnings for overweight containers and hard blocks for pairing errors.
- Updated front-end components to display validation results and prevent submission when errors are present.

apps/edr-freight-web/portal/src/constants/URLS.ts

@@ -126,6 +126,8 @@ export const URL_CONSTANTS = {
       `/api/contracts/${id}/clearance/documents`,
     CLEARANCE_DUTY_SLIP: (id: string) => `/api/contracts/${id}/clearance/duty-slip`,
     BOOKINGS: (id: string) => `/api/contracts/${id}/bookings`,
+    VALIDATE_SHIPMENT: (id: string) =>
+      `/api/contracts/${id}/validate-shipment`,
     MILESTONES: (id: string) => `/api/contracts/${id}/milestones`,
     BOOKING_MILESTONES: (bookingId: string) =>
       `/api/contracts/bookings/${bookingId}/milestones`,