第 5 阶段：纠纷、通知与后台-3

backend/internal/modules/admindashboard/service.go

@@ -0,0 +1,20 @@
+package admindashboard
+
+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) Summary() (*DashboardDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	return s.repo.Summary()
+}