add items per wagon map to cargo types and sync bulk rate units

- Implemented  in the  to manage the physical item capacity for each wagon type.
- Added a new migration to create the  column in the  table.
- Introduced  method in  to update rate units when cargo type unit of measure changes.
- Updated booking calculations to consider items per wagon for break-bulk cargo.
- Refactored various components to utilize the new items fit logic and ensure consistent date formatting across the application.
- Added tests for the new display timezone functionality to ensure consistent date/time representation across different user settings.

apps/edr-freight-api/src/modules/rule-engine/entities/cargo-type.entity.ts

@@ -50,6 +50,16 @@ export class CargoType extends BaseEntity {
   })
   wagonTypes?: WagonType[];
 
+  /**
+   * PER_ITEM (break-bulk) only: how many whole items physically fit each
+   * allowed wagon type, keyed by wagon-type id (e.g. cars → { NW5: 4, NW7: 6 }).
+   * Allocation loads min(this fit, floor(capacityTons / perItemTons)) per
+   * wagon — floor space and rated tonnage bind independently. Keys are kept a
+   * subset of the wagonTypes join rows by the cargo-types service.
+   */
+  @Column({ name: 'items_per_wagon_map', type: 'jsonb', nullable: true })
+  itemsPerWagonMap?: Record<string, number> | null;
+
   @Column({ name: 'requires_director_approval', type: 'boolean', default: false })
   requiresDirectorApproval!: boolean;