fix(train-scheduling): marshalling doc 40ft/20ft counts were always 0

findByIdWithFullGraph loaded containerItems but not
containerItems.bookingContainer, so item.bookingContainer was always
undefined and the 40ft/20ft/total tallies on the Import/Export
Marshalling Document silently read as 0. Load containerType on both the
item and its bookingContainer, and resolve size from whichever is set.

apps/edr-freight-api/src/modules/train-schedules/train-schedules.repository.ts

@@ -39,7 +39,11 @@ export class TrainSchedulesRepository extends BaseRepository<TrainSchedule> {
             physicalWagon: true,
             allocations: {
               booking: { company: true, bookingContainers: { containerType: true } },
-              containerItems: true,
+              // Both size sources loaded: the item's own container_type_id FK
+              // (always set for a manually-entered item) and the booking-line
+              // fallback via bookingContainer.containerType — the marshalling
+              // document's 40ft/20ft tally reads whichever is present.
+              containerItems: { containerType: true, bookingContainer: { containerType: true } },
             },
           },
         },