style: 优化用户信息显示布局

- 用户名和会员标签在同一行水平居中显示
- 会员标签紧跟用户名右侧
- 头像、用户名+会员标签、金币都居中对齐

xuan-deduct-uniapp/src/pages/mine/mine.vue

@@ -163,24 +163,21 @@ page {
 }
 
 .user-name-row {
-  display: flex;
-  align-items: flex-start;
+  display: inline-flex;
+  align-items: center;
   justify-content: center;
-  margin-bottom: 8rpx;
 }
 
 .username {
   font-size: 36rpx;
   font-weight: 700;
   color: #ffffff;
-  line-height: 1.2;
 }
 
 .vip-tag {
   margin-left: 8rpx;
-  padding: 1rpx 8rpx;
+  padding: 2rpx 10rpx;
   border-radius: 12rpx;
-  line-height: 1.2;
 }
 
 .vip-tag.normal {
@@ -204,7 +201,7 @@ page {
 }
 
 .vip-tag-text {
-  font-size: 16rpx;
+  font-size: 18rpx;
   font-weight: 500;
   color: #ffffff;
 }