add permanent purge functionality for wagons and routes

- Implemented a  method in  to permanently delete wagons without history.
- Added corresponding permissions for hard delete actions in .
- Updated the UI components to include purge actions, ensuring they are only available to users with the appropriate permissions.
- Created modals for confirming permanent deletions in  and .
- Enhanced API services to handle purge requests for locomotives, wagons, and routes.
- Added tests for the purge functionality in both  and  services to ensure proper behavior and error handling.

apps/edr-freight-api/src/modules/wagons/wagons.controller.ts

@@ -3,6 +3,8 @@ import {
   Controller,
   Delete,
   Get,
+  HttpCode,
+  HttpStatus,
   Param,
   ParseUUIDPipe,
   Patch,
@@ -12,7 +14,11 @@ import {
 import { ApiOperation, ApiTags } from '@nestjs/swagger';
 import { CurrentUser } from '@edr/api-common';
 import type { TCurrentUser } from '@tria-plc/api-common/modules/auth/types/current-user.type';
-import { FleetManage, StaffReference } from '../../common/booking-guards';
+import {
+  BookingStaff,
+  FleetManage,
+  StaffReference,
+} from '../../common/booking-guards';
 import { FREIGHT_PERMS } from '../../seed/freight-permissions.registry';
 import { CreateWagonDto } from './dto/create-wagon.dto';
 import { ListWagonsQueryDto } from './dto/list-wagons-query.dto';
@@ -69,6 +75,21 @@ export class WagonsController {
     return this.wagonsService.update(id, dto);
   }
 
+  // Declared before @Delete(':id') so "permanent" is never captured as an id.
+  // BookingStaff, not FleetManage: the latter also accepts the coarse
+  // fleet:manage key, which would hand an irreversible purge to everyone who
+  // can edit the fleet. This action requires its own grant, nothing else.
+  @Delete(':id/permanent')
+  @BookingStaff(FREIGHT_PERMS.wagons.hardDelete)
+  @HttpCode(HttpStatus.NO_CONTENT)
+  @ApiOperation({
+    summary:
+      'Permanently delete a wagon (irreversible; refused if it has movements, containers or train-set slots)',
+  })
+  purge(@Param('id', ParseUUIDPipe) id: string) {
+    return this.wagonsService.purge(id);
+  }
+
   @Delete(':id')
   @FleetManage(FREIGHT_PERMS.wagons.delete)
   @ApiOperation({ summary: 'Delete a wagon' })