chore: update admin apis

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 —