feat: add fuel management system backend

- FuelPurchase entity: record fuel purchases with cost tracking
- FuelConsumption entity: monthly aggregation of fuel metrics
- FuelService: record purchases, calculate stats, efficiency
- FuelController: REST API for fuel operations
- FuelModule: integrated into app
- Migration: create fuel_purchases and fuel_consumption tables

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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

@@ -69,6 +69,7 @@ import { WarehousesModule } from './modules/warehouses/warehouses.module';
 import { OverviewModule } from './modules/overview/overview.module';
 import { VehiclesModule } from './modules/vehicles/vehicles.module';
 import { DriversModule } from './modules/drivers/drivers.module';
+import { FuelModule } from './modules/fuel/fuel.module';
 import { FirstMileModule } from './modules/first-mile/first-mile.module';
 import { LastMileModule } from './modules/last-mile/last-mile.module';
 import { InterchangeDocumentsModule } from './modules/interchange-documents/interchange-documents.module';
@@ -133,6 +134,7 @@ import { ImportOperationsModule } from './modules/import-operations/import-opera
     OverviewModule,
     VehiclesModule,
     DriversModule,
+    FuelModule,
     FirstMileModule,
     LastMileModule,
     InterchangeDocumentsModule,