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/migrations/2380000000000-AddTrainDeactivatedStatus.ts

@@ -0,0 +1,23 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * New built-train lifecycle status DEACTIVATED: staff park a train indefinitely
+ * (only allowed while it has no DRAFT/SCHEDULED/DISPATCHED schedule). Like
+ * UNDER_MAINTENANCE / OUT_OF_SERVICE it is staff-owned — the scheduler never
+ * overwrites it and refuses to schedule a deactivated train.
+ *
+ * Postgres cannot drop an enum value, so down() is a no-op.
+ */
+export class AddTrainDeactivatedStatus2380000000000 implements MigrationInterface {
+  name = 'AddTrainDeactivatedStatus2380000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TYPE "freight"."train_status" ADD VALUE IF NOT EXISTS 'DEACTIVATED'`,
+    );
+  }
+
+  public async down(): Promise<void> {
+    // Enum values cannot be removed in Postgres; leaving the label is harmless.
+  }
+}

apps/edr-freight-api/src/migrations/2390000000000-SeedImportTrainNumbers.ts

@@ -0,0 +1,62 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Admin-managed catalog of IMPORT run numbers (even, Djibouti → Ethiopia)
+ * selectable in the Train Builder. The paired EXPORT number is derived
+ * (import − 1), so only the import side is configured. Seeded with the runs
+ * historically hardcoded in the backoffice's trainRuns constants; admins add
+ * new runs from the Dropdown Settings editor.
+ */
+export class SeedImportTrainNumbers2390000000000 implements MigrationInterface {
+  name = 'SeedImportTrainNumbers2390000000000';
+  private readonly code = 'import_train_numbers';
+  private readonly options: string[] = [
+    '8002',
+    '8102',
+    '8202',
+    '8302',
+    '8402',
+    '8502',
+    '8602',
+    '8702',
+    '8802',
+    '8902',
+    '9002',
+  ];
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    const existing = await queryRunner.query(
+      `SELECT id FROM freight.dropdown_settings WHERE code = $1 LIMIT 1;`,
+      [this.code],
+    );
+    if (existing.length > 0) return;
+
+    const inserted = await queryRunner.query(
+      `INSERT INTO freight.dropdown_settings (code, label, description, multiple, meta)
+       VALUES ($1, $2, $3, false, $4::jsonb)
+       RETURNING id;`,
+      [
+        this.code,
+        'Import train numbers',
+        'Even IMPORT run numbers (Djibouti → Ethiopia) selectable when building a train. The paired export number is derived automatically (import − 1).',
+        JSON.stringify({ searchable: true, clearable: true }),
+      ],
+    );
+    const settingId = inserted[0].id;
+
+    for (let i = 0; i < this.options.length; i++) {
+      const value = this.options[i];
+      await queryRunner.query(
+        `INSERT INTO freight.dropdown_options (setting_id, value, label, display_order)
+         VALUES ($1, $2, $3, $4);`,
+        [settingId, value, value, i],
+      );
+    }
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`DELETE FROM freight.dropdown_settings WHERE code = $1;`, [
+      this.code,
+    ]);
+  }
+}

apps/edr-freight-api/src/migrations/2390000000000-WidenYardCodeForSoftDeleteSuffix.ts

@@ -0,0 +1,21 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Yard soft-delete now appends `@<epoch-ms>` to the unique code (SEBETA →
+ * SEBETA@1755612345678) so the name can be reused by a new yard while
+ * UQ_yards_code still spans soft-deleted rows. varchar(20) can't hold long
+ * codes plus the 14-char suffix, so widen to 40.
+ */
+export class WidenYardCodeForSoftDeleteSuffix2390000000000 implements MigrationInterface {
+  name = 'WidenYardCodeForSoftDeleteSuffix2390000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "freight"."yards" ALTER COLUMN "code" TYPE varchar(40)`,
+    );
+  }
+
+  public async down(): Promise<void> {
+    // Narrowing would fail on suffixed codes; keep 40.
+  }
+}