feat: 完成后台Issue#6 数据统计接口模块

internal/routes/admin_routes.go

@@ -20,6 +20,10 @@ func registerAdminRoutes(router *gin.Engine, handler *adminhandler.Handler) {
 		{
 			protected.GET("/profile", handler.Profile)
 			protected.POST("/logout", handler.Logout)
+
+			protected.GET("/stats/overview", handler.StatsOverview)
+			protected.GET("/stats/mini-programs", handler.StatsMiniPrograms)
+			protected.GET("/stats/user-growth", handler.StatsUserGrowth)
 		}
 	}
 }