feat: add wechat miniprogram webview login

miniprogram/pages/web-view/index.wxml

@@ -7,9 +7,16 @@
   />
 </block>
 
-<view wx:else class="setup-screen">
+<view wx:elif="{{loading}}" class="setup-screen">
   <view class="setup-card">
-    <view class="setup-title">需要配置 H5 入口</view>
-    <view class="setup-text">请先在 miniprogram/config.js 填写 WEB_VIEW_ENTRY_URL。</view>
+    <view class="setup-title">正在登录</view>
+  </view>
+</view>
+
+<view wx:else class="setup-screen">
+  <view class="setup-card">
+    <view class="setup-title">无法进入</view>
+    <view class="setup-text">{{errorMessage}}</view>
+    <button class="retry-button" bindtap="handleRetryLogin">重试</button>
   </view>
 </view>