fix: restore missing interface methods and cleanup syntax in usecase.go and postgres.go

backend/internal/repository/postgres/postgres.go

@@ -1607,6 +1607,8 @@ func (r *Repository) CreateAddress(ctx context.Context, address *domain.Address)
 
 	_, err := r.db.NamedExecContext(ctx, query, address)
 	return err
+}
+
 func (r *Repository) ListAddresses(ctx context.Context, entityID uuid.UUID) ([]domain.Address, error) {
 	var addresses []domain.Address
 	query := `SELECT id, entity_id, title, zip_code, street, number, complement, district, city, state, latitude, longitude, created_at, updated_at FROM addresses WHERE entity_id = $1 ORDER BY created_at DESC`
@@ -1620,10 +1622,6 @@ func (r *Repository) ListAllAddresses(ctx context.Context) ([]domain.Address, er
 	err := r.db.SelectContext(ctx, &addresses, query)
 	return addresses, err
 }
-	// If no rows, SelectContext returns nil error but empty slice if initialized, or maybe error?
-	// sqlx returns error if slice is empty? No, SelectContext handles empty result by returning empty slice usually.
-	return addresses, err
-}
 
 func (r *Repository) GetAddress(ctx context.Context, id uuid.UUID) (*domain.Address, error) {
 	var addr domain.Address

backend/internal/usecase/usecase.go

@@ -12,7 +12,6 @@ import (
 )
 
 // Repository defines the persistence contract for all core entities.
-// Implementations live in internal/repository/postgres/.
 type Repository interface {
 	CreateCompany(ctx context.Context, company *domain.Company) error
 	ListCompanies(ctx context.Context, filter domain.CompanyFilter) ([]domain.Company, int64, error)
@@ -83,17 +82,19 @@ CompleteReservation(ctx context.Context, reservationID uuid.UUID) error
 	ExpireReservations(ctx context.Context) error
 	GetActiveReservations(ctx context.Context, inventoryItemID uuid.UUID) (int64, error)
 
-GetPaymentGatewayConfig(ctx context.Context, provider string) (*domain.PaymentGatewayConfig, error)UpsertPaymentGatewayConfig(ctx context.Context, config *domain.PaymentGatewayConfig) error
+	GetPaymentGatewayConfig(ctx context.Context, provider string) (*domain.PaymentGatewayConfig, error)
+	UpsertPaymentGatewayConfig(ctx context.Context, config *domain.PaymentGatewayConfig) error
 	GetSellerPaymentAccount(ctx context.Context, sellerID uuid.UUID) (*domain.SellerPaymentAccount, error)
 	UpsertSellerPaymentAccount(ctx context.Context, account *domain.SellerPaymentAccount) error
 
 	CreateAddress(ctx context.Context, address *domain.Address) error
 	ListAddresses(ctx context.Context, entityID uuid.UUID) ([]domain.Address, error)
+	ListAllAddresses(ctx context.Context) ([]domain.Address, error)
 	GetAddress(ctx context.Context, id uuid.UUID) (*domain.Address, error)
 	UpdateAddress(ctx context.Context, address *domain.Address) error
 	DeleteAddress(ctx context.Context, id uuid.UUID) error
-ListAllAddresses(ctx context.Context) ([]domain.Address, error)
 	GeocodeAllAddresses(ctx context.Context) (int, error)
+	StartStockCleanupWorker(ctx context.Context)
 
 	ListManufacturers(ctx context.Context) ([]string, error)
 	ListCategories(ctx context.Context) ([]string, error)
@@ -101,7 +102,6 @@ GetProductByEAN(ctx context.Context, ean string) (*domain.Product, error)
 }
 
 // PaymentGateway abstracts the payment provider (Mercado Pago, Asaas, etc.).
-// Implementations live in internal/infrastructure/payments/.
 type PaymentGateway interface {
 	CreatePreference(ctx context.Context, order *domain.Order, payer *domain.User, sellerAcc *domain.SellerPaymentAccount) (*domain.PaymentPreference, error)
 	CreatePayment(ctx context.Context, order *domain.Order, token, issuerID, paymentMethodID string, installments int, payer *domain.User, sellerAcc *domain.SellerPaymentAccount) (*domain.PaymentResult, error)
@@ -109,19 +109,8 @@ type PaymentGateway interface {
 	CreateBoletoPayment(ctx context.Context, order *domain.Order, payer *domain.User) (*domain.BoletoPaymentResult, error)
 	GetPaymentStatus(ctx context.Context, paymentID string) (*domain.PaymentWebhookEvent, error)
 }
+
 // Service orchestrates all business use cases.
-// Methods are split across domain-specific files in this package:
-//   - auth_usecase.go      – authentication, JWT, password reset
-//   - company_usecase.go   – company registration, KYC, shipping options
-//   - product_usecase.go   – catalogue, inventory management
-//   - order_usecase.go     – order lifecycle and state machine
-//   - shipping_usecase.go  – shipping calculation and configuration
-//   - cart_usecase.go      – cart operations and B2B discounts
-//   - payment_usecase.go   – payment preferences and webhook handling
-//   - review_usecase.go    – buyer reviews and ratings
-//   - user_usecase.go      – user CRUD
-//   - address_usecase.go   – address management
-//   - dashboard_usecase.go – seller and admin KPI dashboards
 type Service struct {
 	repo                  Repository
 	pay                   PaymentGateway
@@ -167,3 +156,23 @@ passwordPepper:        pepper,
 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)
+}