debug: add temporary register page entry and login debug log

miniprogram/pages/login/login.wxml

@@ -17,5 +17,8 @@
     </button>
 
     <view class="agreement" bindtap="onAgreement">登录即表示同意《用户协议》和《隐私政策》</view>
+
+    <!-- 临时调试入口，上线前删除 -->
+    <view class="debug-entry" bindtap="onDebugRegister">[ 调试 ] 进入注册页</view>
   </view>
 </view>