refactor: migrate to Tencent Cloud backend

miniprogram/pages/login/login.wxml

@@ -9,14 +9,19 @@
 
     <view class="flower-area">
       <text class="flower">🌸</text>
-      <view class="desc">获取你的手机号</view>
-      <view class="desc">提供更好的服务</view>
+      <view class="desc">授权获取微信昵称和头像</view>
+      <view class="desc">用于完善会员资料</view>
     </view>
 
     <button class="login-btn" loading="{{loading}}" bindtap="onLogin" disabled="{{loading}}">
       微信授权登录
     </button>
 
+    <!-- 手机号授权已预留。需要时展示该按钮并隐藏上面的普通登录按钮。 -->
+    <button class="phone-btn disabled-phone-btn" open-type="getPhoneNumber" bindgetphonenumber="onGetPhoneNumber" disabled="{{loading}}">
+      授权手机号登录（预留）
+    </button>
+
     <view class="agreement">登录即表示同意《用户协议》和《隐私政策》</view>
   </view>
 </view>