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/components/trainBuilder/BuildTrainModal.tsx

@@ -16,7 +16,8 @@ import { useEffect, useState } from "react";
 import { api } from "@/services/api";
 import type { TrainComposition } from "@/services/trainBuilder.service";
 import { useToast } from "@/hooks/use-toast";
-import { IMPORT_TRAIN_OPTIONS, exportRunFor } from "@/constants/trainRuns";
+import { useImportTrainNumberOptions } from "@/hooks/useImportTrainNumberOptions";
+import { exportRunFor } from "@/constants/trainRuns";
 
 const parseError = (error: unknown, fallback: string) => {
   if (isAxiosError(error)) {
@@ -42,6 +43,9 @@ export default function BuildTrainModal({ opened, onClose, onBuilt }: BuildTrain
   const [notes, setNotes] = useState("");
 
   const yardsQuery = useQuery(api.routes.yards.queryOptions({ staleTime: 5 * 60_000 }));
+  // Admin-managed run list (dropdown settings); numbers already on a train
+  // come back disabled so they cannot be picked twice.
+  const importNumbers = useImportTrainNumberOptions();
   // Only serviceable locomotives standing in the selected yard can be coupled.
   const locomotivesQuery = useQuery(
     api.locomotives.listFiltered.queryOptions({
@@ -150,12 +154,13 @@ export default function BuildTrainModal({ opened, onClose, onBuilt }: BuildTrain
           <Select
             label="Import train number"
             description="Even — Djibouti → Ethiopia runs"
-            placeholder="e.g. 8002"
-            data={IMPORT_TRAIN_OPTIONS}
+            placeholder={importNumbers.isLoading ? "Loading…" : "e.g. 8002"}
+            data={importNumbers.options}
             value={importTrainNumber || null}
             onChange={(value) => setImportTrainNumber(value ?? "")}
             searchable
             clearable
+            nothingFoundMessage="No free run numbers — add more in Dropdown Settings"
           />
         </Group>
         <Select