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/modules/fuel/dto/create-fuel-purchase.dto.ts

@@ -0,0 +1,40 @@
+import { IsUUID, IsNumber, IsDateString, IsString, IsOptional, IsEnum } from 'class-validator';
+import { PaymentMethod } from '../entities/fuel-purchase.entity';
+
+export class CreateFuelPurchaseDto {
+  @IsUUID()
+  vehicleId!: string;
+
+  @IsDateString()
+  purchaseDate!: string;
+
+  @IsNumber()
+  liters!: number;
+
+  @IsNumber()
+  costPerLiter!: number;
+
+  @IsOptional()
+  @IsString()
+  fuelStation?: string;
+
+  @IsEnum(PaymentMethod)
+  @IsOptional()
+  paymentMethod?: PaymentMethod;
+
+  @IsOptional()
+  @IsNumber()
+  odometerReading?: number;
+
+  @IsOptional()
+  @IsUUID()
+  driverId?: string;
+
+  @IsOptional()
+  @IsString()
+  receiptNumber?: string;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}