fix(订单页面): 调整布局对齐并修复电池容量显示条件

将订单卡片内容对齐方式从space-between改为flex-start以改善视觉效果
添加电池容量显示的条件判断，避免无数据时显示空标签

@@ -253,7 +253,7 @@
   padding-left: 24rpx;
   display: flex;
   flex-direction: column;
-  justify-content: space-between;
+  justify-content: flex-start;
   height: 180rpx; /* 匹配图片高度 */
 }
 

@@ -80,7 +80,7 @@
                   <text class="vehicle-specs">
                     <text v-if="order.details.vehicle.manufacture_year">{{ order.details.vehicle.manufacture_year }}年 | </text>续航{{ order.details.vehicle.range_km }}km
                   </text>
-                  <text class="vehicle-battery">电池容量：{{ order.details.vehicle.battery_capacity_ah }}Ah</text>
+                  <text v-if="order.details.vehicle.battery_capacity_ah" class="vehicle-battery">电池容量：{{ order.details.vehicle.battery_capacity_ah }}Ah</text>
                   <text v-if="order.details.vehicle.price" class="vehicle-price">¥{{ order.details.vehicle.price }}</text>
                 </view>
               </nut-col>