feat(商品管理): 添加获取单个商品信息的API并优化库存配置逻辑

新增`getGoodsInfo` API用于获取单个商品的详细信息，并在库存配置时增加剩余库存的校验和提示，确保分配的库存不超过剩余库存。

src/api/shop/goods.ts

@@ -70,6 +70,15 @@ export const getGoodsListApi = (params?: GoodsQuery) => {
   });
 };
 
+/** 获取单个商品信息 */
+export const getGoodsInfo = (goodsId: number) => {
+  return http.request<ResponseData<GoodsDTO>>("get", "/shop/goods/getGoodsInfo", {
+    params: {
+      goodsId
+    }
+  });
+};
+
 /** 新增商品 */
 export const addGoodsApi = (data: GoodsRequest) => {
   return http.request<ResponseData<void>>("post", "/shop/goods", {

src/views/shop/cabinet-goods/index.vue

@@ -13,6 +13,7 @@ import Refresh from "@iconify-icons/ep/refresh";
 import { ElMessage, ElMessageBox } from "element-plus";
 import { on } from "events";
 import CabinetGoodsConfigModal from "./cabinet-goods-config-modal.vue";
+import { getGoodsInfo } from "@/api/shop/goods";
 
 defineOptions({
   name: "CabinetGoods"
@@ -156,16 +157,33 @@ const switchCellType = (cellType: number) => {
 
 const handleStockConfig = async (row: CabinetCellDTO) => {
   try {
+    // 获取商品详细信息
+    const { data } = await getGoodsInfo(row.goodsId!);
+    const remainingStock = data.stock - data.totalStock + row.stock;
+
     const { value } = await ElMessageBox.prompt(
-      `请输入${row.goodsName || '未配置商品'}的库存数量`,
+      `请输入${row.goodsName || '未配置商品'}的库存数量（本次最多可分配：${remainingStock}）。
+      若可分配数量不足，请先调整商品列表中的库存。`,
       '配置库存',
       {
-        inputPattern: /^0$|^[1-9]\d*/,
+        inputPattern: /^0$|^[1-9]\d*$/,
         inputValue: row.stock?.toString(),
-        inputErrorMessage: '库存必须大于等于0'
+        inputErrorMessage: '请输入有效的非负整数',
+        inputValidator: (inputValue: string) => {
+          const num = Number(inputValue);
+          if (num > remainingStock) {
+            return '分配数量不能超过剩余库存';
+          }
+          return true;
+        }
       }
     );
 
+    if (Number(value) > remainingStock) {
+      ElMessage.warning('分配数量不能超过剩余库存');
+      return;
+    }
+
     await changeGoodsCellsStock(row.cellId!, Number(value));
     ElMessage.success('库存更新成功');
     getList();