fix PackageConfig*.vue style

src/utils/product.ts

@@ -43,6 +43,11 @@ export function normalizeProductQuantity(value: number | string): string | undef
 	return fraction ? `${integer}.${fraction}` : integer;
 }
 
+/** 根据产品数量规则返回数量控件步长。允许小数时固定步进 0.1。 */
+export function getProductQuantityStep(product?: Pick<Product, "allowDecimalQuantity">): number {
+	return product?.allowDecimalQuantity ? .1 : 1;
+}
+
 export function getProductTypeText(type?: ProductType): string {
 	return ({ SERVICE: "服务", GOODS: "实物", CONSUMABLE: "消耗品" } as Record<string, string>)[type || ""] || "未知";
 }