chore: update admin apis

internal/service/admin_service.go

@@ -22,6 +22,7 @@ var ErrAdminUserNotFound = errors.New("user not found")
 // feedback-reply email — no new infrastructure.
 type AdminService struct {
 	repo        *repository.AdminRepo
+	stats       *repository.StatsRepo
 	notif       *NotificationService
 	feedback    *FeedbackService
 	mail        mailer.Mailer
@@ -29,8 +30,15 @@ type AdminService struct {
 	frontendURL string
 }
 
-func NewAdminService(repo *repository.AdminRepo, notif *NotificationService, feedback *FeedbackService, mail mailer.Mailer, logger *zap.Logger, frontendURL string) *AdminService {
-	return &AdminService{repo: repo, notif: notif, feedback: feedback, mail: mail, logger: logger, frontendURL: frontendURL}
+func NewAdminService(repo *repository.AdminRepo, stats *repository.StatsRepo, notif *NotificationService, feedback *FeedbackService, mail mailer.Mailer, logger *zap.Logger, frontendURL string) *AdminService {
+	return &AdminService{repo: repo, stats: stats, notif: notif, feedback: feedback, mail: mail, logger: logger, frontendURL: frontendURL}
+}
+
+// Stats returns the system snapshot (counts + 7-day deltas + feedback
+// breakdown) — the same data the public /stats page renders, as JSON for the
+// admin dashboard home.
+func (s *AdminService) Stats(ctx context.Context) (*repository.StatsSnapshot, error) {
+	return s.stats.Snapshot(ctx)
 }
 
 // AcknowledgeFeedback marks a feedback row acknowledged and emails the author