feat: replace *Service suffix with role-based class names

src/Form/Service/ParticipantPromoVoucherFieldHandler.php

@@ -6,8 +6,8 @@ namespace App\Form\Service;
 
 use App\Form\Model\BookingDto;
 use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
-use App\Service\BookingPriceCalculatorService;
-use App\Service\VoucherValidationService;
+use App\Service\BookingPriceCalculator;
+use App\Service\VoucherValidator;
 
 /**
  * Handles promotional voucher code field processing.
@@ -22,8 +22,8 @@ use App\Service\VoucherValidationService;
 class ParticipantPromoVoucherFieldHandler extends AbstractParticipantFieldHandler
 {
     public function __construct(
-        private readonly VoucherValidationService $voucherValidationService,
-        private readonly BookingPriceCalculatorService $priceCalculatorService,
+        private readonly VoucherValidator $voucherValidationService,
+        private readonly BookingPriceCalculator $priceCalculatorService,
     ) {
     }