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

@@ -9,7 +9,8 @@ export type BuiltTrainStatus =
   | "SCHEDULED"
   | "IN_SERVICE"
   | "UNDER_MAINTENANCE"
-  | "OUT_OF_SERVICE";
+  | "OUT_OF_SERVICE"
+  | "DEACTIVATED";
 
 export interface YardRefLite {
   id: string;
@@ -140,6 +141,12 @@ export interface BuildTrainPayload {
   notes?: string;
 }
 
+/** Run numbers already claimed by existing (non-deleted) trains. */
+export interface UsedTrainNumbers {
+  importTrainNumbers: string[];
+  exportTrainNumbers: string[];
+}
+
 /** Edit a built train's display identity; omitted fields keep their value. */
 export interface UpdateTrainDetailsPayload {
   /** Empty string clears the name. */
@@ -261,6 +268,8 @@ export const trainBuilderService = {
   list: (filters: BuiltTrainListFilters = {}) =>
     apiClient.get<BuiltTrainListResponse>(`${BASE}${toQuery(filters)}`),
   getComposition: (id: string) => apiClient.get<TrainComposition>(`${BASE}/${id}`),
+  /** Import/export run numbers already claimed by existing trains. */
+  usedTrainNumbers: () => apiClient.get<UsedTrainNumbers>(`${BASE}/used-train-numbers`),
   build: (payload: BuildTrainPayload) => apiClient.post<TrainComposition>(BASE, payload),
   setLocomotives: (id: string, locomotiveIds: string[]) =>
     apiClient.put<TrainComposition>(`${BASE}/${id}/locomotives`, { locomotiveIds }),
@@ -279,6 +288,11 @@ export const trainBuilderService = {
     apiClient.post<TrainComposition>(`${BASE}/${id}/wagons/${wagonId}/maintenance`),
   reorderWagons: (id: string, wagonIds: string[]) =>
     apiClient.post<TrainComposition>(`${BASE}/${id}/reorder-wagons`, { wagonIds }),
+  /** Park the train indefinitely — only allowed with no active schedule. */
+  deactivate: (id: string) =>
+    apiClient.post<TrainComposition>(`${BASE}/${id}/deactivate`),
+  /** Bring a DEACTIVATED train back to AVAILABLE. */
+  activate: (id: string) => apiClient.post<TrainComposition>(`${BASE}/${id}/activate`),
   disband: (id: string) => apiClient.delete<void>(`${BASE}/${id}`),
   /** Built trains schedulable on a route (train-scheduling picker). */
   availableTrains: (routeId: string) =>