完善后端联调链路与模拟器多通道支持

miniprogram/pages/login/login.wxml

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+<scroll-view class="page" scroll-y>
+  <view class="shell">
+    <view class="hero">
+      <view class="hero__eyebrow">CMR Backend</view>
+      <view class="hero__title">登录</view>
+      <view class="hero__desc">先把小程序登录态接到 backend，再进入首页和活动页。</view>
+    </view>
+
+    <view class="panel">
+      <view class="panel__title">连接配置</view>
+      <view class="field">
+        <view class="field__label">Backend Base URL</view>
+        <input class="field__input" value="{{backendBaseUrl}}" bindinput="handleBaseUrlInput" />
+      </view>
+      <view class="field">
+        <view class="field__label">Device Key</view>
+        <input class="field__input" value="{{deviceKey}}" bindinput="handleDeviceKeyInput" />
+      </view>
+      <view class="field">
+        <view class="field__label">开发登录 Code</view>
+        <input class="field__input" value="{{loginCode}}" bindinput="handleLoginCodeInput" />
+      </view>
+      <view class="actions">
+        <button class="btn btn--primary" bindtap="handleLoginWithDevCode">开发码登录</button>
+        <button class="btn btn--secondary" bindtap="handleLoginWithWechat">wx.login 登录</button>
+        <button class="btn btn--ghost" bindtap="handleClearLoginState">清空登录态</button>
+      </view>
+    </view>
+
+    <view class="panel">
+      <view class="panel__title">状态</view>
+      <view class="status">{{statusText}}</view>
+    </view>
+  </view>
+</scroll-view>