fix(user-center): 1:1 port reference sidebar statistics row and icon box line-height

- Rewrite sidebar stats as a single zib-widget row (user-statistics-item, em14 / em09 opacity5 mt6), drop legacy .uc-stats styles
- Restore reference body line-height (1.42857143) on stats and service/settings boxes
- Move 我的订单 to the front of 我的服务 to match reference order

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/css/routes/user-center/responsive.css

@@ -216,18 +216,6 @@
     padding: 0 12px 32px;
   }
 
-  .uc-stats {
-    grid-template-columns: repeat(4, 1fr);
-  }
-
-  .uc-stats__item {
-    padding: 8px 4px;
-  }
-
-  .uc-stats__value {
-    font-size: 1rem;
-  }
-
   .uc-content .dashboard-panel {
     padding: 14px;
   }