add hard capacity ceiling to weight limit rules

apps/edr-freight-web/portal/src/services/contracts.service.ts

@@ -71,6 +71,8 @@ export interface ShipmentValidation {
   overweightSurchargeAmount: number;
   currency: string | null;
   pairingErrors: string[];
+  /** Lines above the container type's hard max capacity — booking cannot be created. */
+  capacityErrors?: string[];
   lineItems?: ShipmentPriceLine[];
   totalAmount?: number;
 }