chore: remove debug code and restore phone authorization as required

- Remove debug register page entry and console.log from login
- Remove phone skip option, phone authorization is mandatory
- Restore incomplete registration check (no phone → redirect to register)

miniprogram/pages/login/login.wxss

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