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/services/api.ts

@@ -24,6 +24,7 @@ import {
   ContractDocuments,
   GenerateContractPriceResponse,
   SubmitContractResponse,
+  ShipmentValidation,
 } from "./contracts.service";
 import type { BookingDocuments } from "@/pages/bookings/new-booking-form/schema";
 import {
@@ -462,6 +463,13 @@ export const api = {
       contractsService.createBookingUnderContract(id, dto),
     ),
 
+    validateShipment: endpoint<
+      { id: string; dto: Freight.CreateBookingUnderContractDto },
+      ShipmentValidation
+    >("contracts", "validateShipment", ({ id, dto }) =>
+      contractsService.validateShipment(id, dto),
+    ),
+
     getContractMilestones: endpoint<
       { id: string },
       Freight.IClearanceMilestone[]