Add train deactivation feature and import train number management

- Introduced DEACTIVATED status for trains, allowing staff to park trains indefinitely.
- Implemented methods to deactivate and reactivate trains in the TrainBuilderService.
- Added UI components for train deactivation and reactivation in TrainBuilderDetailPage.
- Created a dropdown setting for admin-managed import train numbers, with corresponding migrations.
- Updated yard code length to accommodate soft-delete suffix.
- Enhanced train status handling to include DEACTIVATED state.

apps/edr-freight-api/src/modules/trains/train-builder.controller.ts

@@ -44,6 +44,15 @@ export class TrainBuilderController {
     return this.trainBuilderService.listBuilt(query);
   }
 
+  // Must be declared before @Get(':id') so the path isn't captured as an id.
+  @Get('used-train-numbers')
+  @ApiOperation({
+    summary: 'Import/export run numbers already claimed by existing trains',
+  })
+  usedTrainNumbers() {
+    return this.trainBuilderService.usedTrainNumbers();
+  }
+
   @Get(':id')
   @ApiOperation({ summary: 'Full train composition: locomotives, ordered wagons, totals vs. limits' })
   composition(@Param('id', ParseUUIDPipe) id: string) {
@@ -115,6 +124,22 @@ export class TrainBuilderController {
     return this.trainBuilderService.reorderWagons(id, dto);
   }
 
+  @Post(':id/deactivate')
+  @FleetManage()
+  @ApiOperation({
+    summary: 'Deactivate the train (park it) — only allowed with no active schedule',
+  })
+  deactivate(@Param('id', ParseUUIDPipe) id: string) {
+    return this.trainBuilderService.deactivate(id);
+  }
+
+  @Post(':id/activate')
+  @FleetManage()
+  @ApiOperation({ summary: 'Reactivate a deactivated train back to AVAILABLE' })
+  activate(@Param('id', ParseUUIDPipe) id: string) {
+    return this.trainBuilderService.activate(id);
+  }
+
   @Delete(':id')
   @FleetManage()
   @HttpCode(HttpStatus.NO_CONTENT)