fix: add missing GET /api/fuel/purchases endpoint

Problem:
- Frontend calls GET /fuel/purchases (all purchases)
- Backend only had GET /fuel/purchases/:vehicleId (specific vehicle)
- Result: 404 when loading fuel purchases list

Solution:
- Added getAllFuelPurchases() to FuelService
- Added GET /fuel/purchases route to FuelController
- Route placed before parameterized route so it gets matched first
- Returns all fuel purchases ordered by date DESC

Endpoints:
- GET /api/fuel/purchases → all purchases
- GET /api/fuel/purchases/:vehicleId → specific vehicle
- POST /api/fuel/purchases → record purchase

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

apps/edr-freight-api/src/modules/fuel/fuel.controller.ts

@@ -14,6 +14,12 @@ export class FuelController {
     return this.fuelService.recordFuelPurchase(dto);
   }
 
+  @Get('purchases')
+  @ApiOperation({ summary: 'Get all fuel purchases' })
+  async getAllFuelPurchases() {
+    return this.fuelService.getAllFuelPurchases();
+  }
+
   @Get('purchases/:vehicleId')
   @ApiOperation({ summary: 'Get fuel purchases for vehicle' })
   async getFuelPurchases(