feat(商品详情): 重构商品详情页以适配后端数据接口

- 替换静态数据为动态接口获取
- 更新字段映射以匹配后端返回结构
- 添加数据加载和空值处理逻辑
- 使用nut-rate组件替代手动星级显示

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-07-10 17:47:49
+ * @LastEditTime: 2025-07-11 12:18:58
  * @FilePath: /jgdl/src/pages/myCar/index.vue
  * @Description: 文件描述
 -->
@@ -57,8 +57,8 @@
                     <nut-ellipsis direction="end" :content="car.note" :rows="2"></nut-ellipsis>
                   </view>
                   <view class="price-section">
-                    <view class="current-price">¥{{ car.price }}</view>
-                    <view class="market-price">市场价 ¥{{ car.market_price }}</view>
+                    <view v-if="car.price" class="current-price">¥{{ car.price }}</view>
+                    <view v-if="car.market_price" class="market-price">市场价 ¥{{ car.market_price }}</view>
                   </view>
                 </view>
               </nut-col>

@@ -219,7 +219,7 @@
                     </view>
                     <view class="form-item-right">
                         <text class="price-symbol">¥</text>
-                        <input v-model="formData.price" placeholder="3200" type="text" class="price-input" />
+                        <input v-model="formData.price" placeholder="请输入" type="text" class="price-input" />
                     </view>
                 </view>
 
@@ -230,7 +230,7 @@
                     </view>
                     <view class="form-item-right">
                         <text class="market-price-symbol">¥</text>
-                        <input v-model="formData.market_price" placeholder="6500" type="text"
+                        <input v-model="formData.market_price" placeholder="请输入" type="text"
                             class="market-price-input" />
                     </view>
                 </view>
@@ -381,8 +381,8 @@ const formData = reactive({
     // batteryWear: '',
     brake_wear_level: '',
     tire_wear_level: '',
-    price: '3200',
-    market_price: '6500',
+    price: '',
+    market_price: '',
     note: '',
     // 车辆照片字段
     front_photo: '',