chore: merge coupon as regular directory (replace submodule)

coupon/miniprogram/miniprogram_npm/@vant/weapp/loading/index.wxml

@@ -0,0 +1,19 @@
+<wxs src="../wxs/utils.wxs" module="utils" />
+<wxs src="./index.wxs" module="computed" />
+
+<view class="custom-class {{ utils.bem('loading', { vertical }) }}">
+  <view
+    class="van-loading__spinner van-loading__spinner--{{ type }}"
+    style="{{ computed.spinnerStyle({ color, size }) }}"
+  >
+    <view
+      wx:if="{{ type === 'spinner' }}"
+      wx:for="{{ array12 }}"
+      wx:key="index"
+      class="van-loading__dot"
+    />
+  </view>
+  <view class="van-loading__text" style="{{ computed.textStyle({ textSize }) }}">
+    <slot />
+  </view>
+</view>