fix: 添加已售车辆状态显示并调整按钮显示逻辑

在车辆卡片中添加已售状态显示，并仅在车辆未售出时显示操作按钮

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-07-17 11:31:47
+ * @LastEditTime: 2025-07-18 12:59:56
  * @FilePath: /jgdl/src/pages/myAuthCar/index.vue
  * @Description: 我的认证车页面
 -->
@@ -60,7 +60,7 @@
                                         </text>
                                     </view>
                                 </view> -->
-                                <view class="action-buttons mt-4">
+                                <view v-if="!item.is_sold" class="action-buttons mt-4">
                                     <nut-button
                                         v-if="item.review_status === 7"
                                         @click.stop="handleSellClick(item)"
@@ -81,6 +81,7 @@
                                         认证
                                     </nut-button>
                                 </view>
+                                <view v-else style="color: red; font-size: 26rpx; margin-top: 5rpx;">已出售</view>
                             </view>
                         </view>
                     </view>