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-web/backoffice/src/services/wagon.service.ts

@@ -123,6 +123,8 @@ export const wagonService = {
   create: (data: Partial<Wagon>) => apiClient.post('/wagons', data),
   update: (id: string, data: Partial<Wagon>) => apiClient.patch(`/wagons/${id}`, data),
   delete: (id: string) => apiClient.delete(`/wagons/${id}`),
+  /** Irreversible purge — the API refuses it when the wagon has any history. */
+  purge: (id: string) => apiClient.delete(`/wagons/${id}/permanent`),
   /** Relocate many wagons to one yard in a single call (writes movement ledger). */
   bulkTransfer: (wagonIds: string[], toYardId: string) =>
     apiClient.post<{ moved: number }>('/wagons/bulk-transfer', { wagonIds, toYardId }),