debug: add temporary register page entry and login debug log

miniprogram/pages/login/login.wxss

@@ -53,3 +53,11 @@
   color: #999999;
   margin-top: 32rpx;
 }
+
+.debug-entry {
+  text-align: center;
+  font-size: 24rpx;
+  color: #E6508C;
+  margin-top: 40rpx;
+  padding: 16rpx;
+}