第 5 阶段：纠纷、通知与后台-1

backend/internal/modules/notification/service.go

@@ -0,0 +1,27 @@
+package notification
+
+import "errors"
+
+var ErrDependencyUnavailable = errors.New("dependency unavailable")
+
+type Service struct {
+	repo *Repository
+}
+
+func NewService(repo *Repository) *Service {
+	return &Service{repo: repo}
+}
+
+func (s *Service) List(userID uint64) ([]NotificationDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	return s.repo.List(userID)
+}
+
+func (s *Service) MarkRead(userID uint64, id uint64) error {
+	if s.repo == nil {
+		return ErrDependencyUnavailable
+	}
+	return s.repo.MarkRead(userID, id)
+}