fix: resolve duplicate methods and missing imports in usecases

backend/internal/usecase/address_usecase.go

@@ -3,6 +3,7 @@ package usecase
 import (
 	"context"
 	"errors"
+	"time"
 
 	"github.com/gofrs/uuid/v5"
 

backend/internal/usecase/product_usecase.go

@@ -2,8 +2,11 @@ package usecase
 
 import (
 	"context"
+	"errors"
+	"fmt"
 	"math"
 	"strings"
+	"time"
 
 	"github.com/gofrs/uuid/v5"
 

backend/internal/usecase/usecase.go

@@ -157,22 +157,3 @@ func (s *Service) GetNotificationService() notifications.NotificationService {
 	return s.notify
 }
 
-// DeleteAddress handles address removal logic.
-func (s *Service) DeleteAddress(ctx context.Context, id uuid.UUID) error {
-	return s.repo.DeleteAddress(ctx, id)
-}
-
-// ListManufacturers returns manufacturers from the repo.
-func (s *Service) ListManufacturers(ctx context.Context) ([]string, error) {
-	return s.repo.ListManufacturers(ctx)
-}
-
-// ListCategories returns categories from the repo.
-func (s *Service) ListCategories(ctx context.Context) ([]string, error) {
-	return s.repo.ListCategories(ctx)
-}
-
-// GetProductByEAN finds a product by its EAN code.
-func (s *Service) GetProductByEAN(ctx context.Context, ean string) (*domain.Product, error) {
-	return s.repo.GetProductByEAN(ctx, ean)
-}