chore: update admin apis

internal/handler/admin.go

@@ -46,6 +46,16 @@ func meta(total, limit, offset int) *response.Meta {
 	}
 }
 
+// Stats — GET /admin/stats → system snapshot for the dashboard home.
+func (h *AdminHandler) Stats(w http.ResponseWriter, r *http.Request) {
+	snap, err := h.svc.Stats(r.Context())
+	if err != nil {
+		response.Error(w, http.StatusInternalServerError, "could not load stats")
+		return
+	}
+	response.JSON(w, http.StatusOK, snap)
+}
+
 func (h *AdminHandler) ListUsers(w http.ResponseWriter, r *http.Request) {
 	q, limit, offset := pageParams(r)
 	items, total, err := h.svc.ListUsers(r.Context(), q, limit, offset)

internal/repository/stats_repo.go

@@ -17,22 +17,22 @@ func NewStatsRepo(pg *Postgres) *StatsRepo { return &StatsRepo{pg: pg} }
 // StatsSnapshot bundles totals, last-7-days counts, and feedback
 // category breakdowns. One value rendered by /stats per request.
 type StatsSnapshot struct {
-	Users              int
-	UsersLast7Days     int
-	Posts              int
-	PostsLast7Days     int
-	Collections        int
-	PublicCollections  int
-	Bookmarks          int
-	Reshares           int
-	Feedback           int
-	FeedbackLast7Days  int
-	FeedbackByCategory []CategoryCount
+	Users              int             `json:"users"`
+	UsersLast7Days     int             `json:"users_last_7_days"`
+	Posts              int             `json:"posts"`
+	PostsLast7Days     int             `json:"posts_last_7_days"`
+	Collections        int             `json:"collections"`
+	PublicCollections  int             `json:"public_collections"`
+	Bookmarks          int             `json:"bookmarks"`
+	Reshares           int             `json:"reshares"`
+	Feedback           int             `json:"feedback"`
+	FeedbackLast7Days  int             `json:"feedback_last_7_days"`
+	FeedbackByCategory []CategoryCount `json:"feedback_by_category"`
 }
 
 type CategoryCount struct {
-	Category string
-	Count    int
+	Category string `json:"category"`
+	Count    int    `json:"count"`
 }
 
 // Snapshot runs every count needed by /stats. Queries run in series —

internal/server/server.go

@@ -290,7 +290,7 @@ func (s *Server) initAuth(cfg *config.Config, logger *zap.Logger) {
 	// Reuses the notification service (delivery) and mailer (feedback reply).
 	// Gated by RequireAuth + RequireAdmin in the router.
 	adminRepo := repository.NewAdminRepo(s.pg)
-	adminSvc := service.NewAdminService(adminRepo, notifSvc, feedbackSvc, mail, logger, cfg.FrontendURL)
+	adminSvc := service.NewAdminService(adminRepo, statsRepo, notifSvc, feedbackSvc, mail, logger, cfg.FrontendURL)
 	s.adminH = handler.NewAdminHandler(adminSvc)
 }
 
@@ -986,6 +986,7 @@ func (s *Server) setupRouter() {
 			}
 			r.Use(middleware.RequireAuth(s.authIssuer, s.userRepo))
 			r.Use(middleware.RequireAdmin(s.userRepo))
+			r.Get("/stats", s.adminH.Stats)
 			r.Get("/users", s.adminH.ListUsers)
 			r.Post("/users/{id}/notify", s.adminH.NotifyUser)
 			r.Post("/users/{id}/ban", s.adminH.BanUser)

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