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/seed/dropdown-settings.seeder.ts

@@ -48,6 +48,14 @@ const DEFAULT_DROPDOWN_SETTINGS: DefaultDropdownSetting[] = [
       "Minimum days between today and the vessel departure date on an export Release Order.",
     multiple: false,
   },
+  {
+    code: "import_train_numbers",
+    label: "Import train numbers",
+    description:
+      "Even IMPORT run numbers (Djibouti → Ethiopia) selectable when building a train. The paired export number is derived automatically (import − 1).",
+    multiple: false,
+    meta: { searchable: true, clearable: true },
+  },
 ];
 
 @Injectable()