fix: 更新API端点路径和单次洗车支付流程

- 将多个API端点从相对路径更新为完整URL
- 修改单次洗车配置和支付流程接口路径
- 更新listDetail页面时间字段显示为created_at
- 调整index页面单次洗车选项的显示和支付逻辑
- 添加单次洗车弹窗的样式定义

pages/index/index.wxss

@@ -171,4 +171,55 @@
 
 .washing .l {
   flex: 1;
-}
+}
+
+/* 单次消费弹窗 */
+.one-time-modal {
+    position: fixed;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    background: rgba(0,0,0,0.5);
+    z-index: 1000;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+.one-time-inner {
+    width: 84%;
+    background: #fff;
+    border-radius: 16rpx;
+    padding: 24rpx 24rpx 16rpx;
+    box-shadow: 0 10rpx 30rpx rgba(0,0,0,.2);
+}
+.one-time-title {
+    font-size: 32rpx;
+    font-weight: 600;
+    color: #333;
+    text-align: center;
+}
+.one-time-tip {
+    font-size: 24rpx;
+    color: #999;
+    text-align: center;
+    margin-top: 8rpx;
+}
+.one-time-list {
+    margin-top: 20rpx;
+}
+.one-time-item {
+    border: 1px solid #eee;
+    border-radius: 12rpx;
+    padding: 20rpx;
+    margin-bottom: 16rpx;
+}
+.one-time-cancel {
+    margin-top: 8rpx;
+    background-color: #06a2b3;
+    color: #fff;
+    text-align: center;
+    line-height: 80rpx;
+    height: 80rpx;
+    border-radius: 12rpx;
+}