fix: 移除价格输入框中的逗号分隔符以保持一致

统一价格输入框和默认值的格式，移除逗号分隔符以避免潜在的数据处理问题

@@ -209,7 +209,7 @@
                     </view>
                     <view class="form-item-right">
                         <text class="price-symbol">¥</text>
-                        <input v-model="formData.sellingPrice" placeholder="3,200" type="text" class="price-input" />
+                        <input v-model="formData.sellingPrice" placeholder="3200" type="text" class="price-input" />
                     </view>
                 </view>
 
@@ -220,7 +220,7 @@
                     </view>
                     <view class="form-item-right">
                         <text class="market-price-symbol">¥</text>
-                        <input v-model="formData.marketPrice" placeholder="6,500" type="text"
+                        <input v-model="formData.marketPrice" placeholder="6500" type="text"
                             class="market-price-input" />
                     </view>
                 </view>
@@ -360,8 +360,8 @@ const formData = reactive({
     batteryWear: '',
     brakeWear: '',
     tireWear: '',
-    sellingPrice: '3,200',
-    marketPrice: '6,500',
+    sellingPrice: '3200',
+    marketPrice: '6500',
     description: ''
 })
 
@@ -798,8 +798,8 @@ const loadCarData = async () => {
             batteryWear: '轻微磨损',
             brakeWear: '轻微磨损',
             tireWear: '轻微磨损',
-            sellingPrice: '3,200',
-            marketPrice: '6,500',
+            sellingPrice: '3200',
+            marketPrice: '6500',
             description: '车况良好，电池续航正常，无重大事故，平时保养得当。',
             images: {
                 front: 'https://picsum.photos/300/200?random=1',