public function variants(string $product, LangRequest $request): JsonResource 	{ 		$product = Product::getProductByIdOrSlug($product, $request->lang);  		$variants = $product->productSibling?->products() 			->available() 			->whereNot('id', $product->id) 			->orderBy('id') 			->simplePaginate();  		return ProductListResource::collection($variants ?? []); 	}