feat: add top items on admin page

backend/main.go

@@ -66,6 +66,7 @@ func main() {
 			admin.POST("/register", handlers.RegisterAdmin)
 			admin.GET("/orders", handlers.GetAllOrders)
 			admin.PATCH("/orders/:id", handlers.UpdateOrderStatus)
+			admin.GET("/items/top", handlers.GetTopItems)
 			admin.PATCH("/items/:id/avatar", handlers.UploadItemAvatar)
 			admin.POST("/stock/in", handlers.StockIn)
 			admin.POST("/stock/out", handlers.StockOut)