fix: 修复价格输入验证并统一使用@input事件

修复价格输入验证逻辑，防止多个小数点和以小数点开头的情况
使用@input替代@onInput事件监听，确保视图及时更新

@@ -219,7 +219,7 @@
                     </view>
                     <view class="form-item-right">
                         <text class="price-symbol">¥</text>
-                        <input v-model="formData.price" placeholder="请输入" type="digit" class="price-input" @onInput="validatePriceInput" />
+                        <input v-model="formData.price" placeholder="请输入" type="digit" class="price-input" @input="validatePriceInput" />
                     </view>
                 </view>
 
@@ -231,7 +231,7 @@
                     <view class="form-item-right">
                         <text class="market-price-symbol">¥</text>
                         <input v-model="formData.market_price" placeholder="请输入" type="digit"
-                            class="market-price-input" @onInput="validateMarketPriceInput" />
+                            class="market-price-input" @input="validateMarketPriceInput" />
                     </view>
                 </view>
             </view>
@@ -609,17 +609,26 @@ const showTireWearPicker = () => {
  * @param {Object} event - 输入事件对象
  */
 const validatePriceInput = (event) => {
-    const value = event.detail.value
-    const validValue = value.replace(/[^0-9.]/g, '')
-
-    // 防止多个小数点
-    const parts = validValue.split('.')
-    if (parts.length > 2) {
-        const newValue = parts[0] + '.' + parts.slice(1).join('')
-        formData.price = newValue
-    } else {
-        formData.price = validValue
+    let value = event.detail.value
+
+    // 只保留数字和小数点，删除其他字符
+    value = value.replace(/[^0-9.]/g, '')
+
+    // 防止多个小数点，只保留第一个小数点
+    const dotIndex = value.indexOf('.')
+    if (dotIndex !== -1) {
+        value = value.substring(0, dotIndex + 1) + value.substring(dotIndex + 1).replace(/\./g, '')
     }
+
+    // 防止以小数点开头
+    if (value.startsWith('.')) {
+        value = '0' + value
+    }
+
+    // 使用 nextTick 确保视图更新
+    Taro.nextTick(() => {
+        formData.price = value
+    })
 }
 
 /**
@@ -627,17 +636,26 @@ const validatePriceInput = (event) => {
  * @param {Object} event - 输入事件对象
  */
 const validateMarketPriceInput = (event) => {
-    const value = event.detail.value
-    const validValue = value.replace(/[^0-9.]/g, '')
-
-    // 防止多个小数点
-    const parts = validValue.split('.')
-    if (parts.length > 2) {
-        const newValue = parts[0] + '.' + parts.slice(1).join('')
-        formData.market_price = newValue
-    } else {
-        formData.market_price = validValue
+    let value = event.detail.value
+
+    // 只保留数字和小数点，删除其他字符
+    value = value.replace(/[^0-9.]/g, '')
+
+    // 防止多个小数点，只保留第一个小数点
+    const dotIndex = value.indexOf('.')
+    if (dotIndex !== -1) {
+        value = value.substring(0, dotIndex + 1) + value.substring(dotIndex + 1).replace(/\./g, '')
     }
+
+    // 防止以小数点开头
+    if (value.startsWith('.')) {
+        value = '0' + value
+    }
+
+    // 使用 nextTick 确保视图更新
+    Taro.nextTick(() => {
+        formData.market_price = value
+    })
 }
 
 /**