feat: init project with miniprogram, cloud functions and admin console

miniprogram/pages/subscribe-plans/subscribe-plans.wxml

@@ -0,0 +1,15 @@
+<view class="container">
+  <view wx:for="{{plans}}" wx:key="plan"
+        class="card plan-card {{selected === item.plan ? 'plan-active' : ''}}"
+        bindtap="onSelect" data-plan="{{item.plan}}">
+    <view class="plan-name">{{item.name}}</view>
+    <view class="plan-price">{{item.price}}</view>
+    <view class="plan-desc text-muted">{{item.desc}}</view>
+  </view>
+
+  <view class="btn-area-fixed">
+    <view class="btn-primary" bindtap="onPurchase" disabled="{{purchasing || !selected}}">
+      {{purchasing ? '处理中...' : '立即订阅'}}
+    </view>
+  </view>
+</view>