Add freight demo data seeder and permissions management

- Introduced `DemoFreightDataSeeder` to seed demo freight data including wagons, approval rules, and staff users.
- Added `seed:freight-demo` script to `package.json` for easy execution.
- Updated permissions for operations officer and added permission checks in various components.
- Enhanced sidebar and booking actions to respect user permissions.

apps/edr-freight-api/src/app.module.ts

@@ -48,6 +48,7 @@ import { DemoBookingsSeeder } from "./seed/demo-bookings.seeder";
 import { PricingDataSeeder } from "./seed/pricing-data.seeder";
 import { FileUploadSettingsSeeder } from "./seed/file-upload-settings.seeder";
 import { FreightPermissionKeyMigrationSeeder } from "./seed/freight-permission-key-migration.seeder";
+import { DemoFreightDataSeeder } from "./seed/demo-freight-data.seeder";
 //New Trains, Wagons, Container and Cargo management modules
 import { TrainsModule } from "./modules/trains/trains.module";
 import { WagonsModule } from './modules/wagons/wagons.module';
@@ -121,6 +122,7 @@ import { OverviewModule } from './modules/overview/overview.module';
     PricingDataSeeder,
     FileUploadSettingsSeeder,
     FreightPermissionKeyMigrationSeeder,
+    DemoFreightDataSeeder,
   ],
 })
 export class AppModule implements OnApplicationBootstrap {
@@ -133,6 +135,7 @@ export class AppModule implements OnApplicationBootstrap {
     private readonly pricingDataSeeder: PricingDataSeeder,
     private readonly fileUploadSettingsSeeder: FileUploadSettingsSeeder,
     private readonly freightPermissionKeyMigrationSeeder: FreightPermissionKeyMigrationSeeder,
+    private readonly demoFreightDataSeeder: DemoFreightDataSeeder,
   ) { }
 
   async onApplicationBootstrap() {
@@ -144,5 +147,8 @@ export class AppModule implements OnApplicationBootstrap {
     await this.demoBookingsSeeder.run();
     await this.pricingDataSeeder.run();
     await this.fileUploadSettingsSeeder.run();
+    // Idempotent demo data: ≥100 wagons/type, approval chains, 4 staff users.
+    // Each block self-guards on an empty-table check, so this is safe every boot.
+    await this.demoFreightDataSeeder.run();
   }
 }