feat(单次洗车): 实现单次洗车功能并优化界面样式

- 新增单次洗车页面，包含金额选择、协议勾选和注意事项
- 调整首页扫码启动按钮为单次启动和余额启动双按钮
- 优化单次洗车页面样式和交互逻辑
- 移除首页单次消费弹窗及相关逻辑

pages/index/index.wxss

@@ -32,6 +32,17 @@
     position: static;
 }
 
+.two-btn .two-btns {
+  float: left;
+  width: 50%;
+  height: 126rpx;
+  padding-top: 10rpx;
+}
+
+.two-btns.yue {
+  background-color: #f60;
+}
+
 .start-btn-box .scan-subscribe {
     margin-right: 10rpx;
 }
@@ -118,7 +129,7 @@
     top:  -20rpx;
     color: #fff;
     background-color: #0056A3;
-    font-size: 22rpx;
+    font-size: 24rpx;
     padding: 0 12rpx;
     line-height: 36rpx;
     border-radius: 0 0 0 20rpx;
@@ -157,69 +168,4 @@
     right: 0;
     display: block;
     background-color: #37CE05;
-}
-
-.washing {
-    justify-content: space-between;
-    margin: 30rpx 0 0;
-    padding: 20rpx 28rpx;
-    display: flex;
-    background-color: #0056A3;
-    color: #fff;
-    font-size: 28rpx;
-}
-
-.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;
-}
+}