feat: add wagon usage computation and maintenance logging features

- Implemented  utility to calculate wagon usage metrics for train schedules.
- Created  for sending wagons to maintenance with optional notes.
- Added unit tests for train builder maintenance functionalities, including formatting train run labels and building maintenance notes.
- Developed  component for merging train schedules with detailed previews and reasons for merging.
- Introduced  component for selecting wagons with search functionality and selection limits.
- Created  for displaying and filtering audit logs, including detailed views of individual log entries.
- Added  for handling API interactions related to audit logs, including fetching logs and entity types.

apps/edr-freight-api/src/modules/train-schedules/entities/train-schedule.entity.ts

@@ -64,6 +64,14 @@ export class TrainSchedule extends BaseEntity {
   @Column({ name: 'train_number', type: 'varchar', length: 20, nullable: true })
   trainNumber?: string | null;
 
+  /**
+   * Voyage (sailing) number for this departure — the identifier yards and
+   * customs quote alongside the train number. Per-departure, so it lives here
+   * rather than on the built train.
+   */
+  @Column({ name: 'voyage_number', type: 'varchar', length: 20, nullable: true })
+  voyageNumber?: string | null;
+
   // Human-facing unique schedule reference (S-YYYY-NNNNN). Shown on the schedule
   // list, booking windows, and load lists. Assigned at creation from the highest
   // sequence issued this year (see TrainSchedulesRepository.maxReferenceSequence).