refactor(mp): 迁移商城+AI报告+预约列表+文章详情页 — 统一组件库

商城订单/积分兑换/积分明细、AI 报告列表、预约列表、
文章详情共 6 个页面迁移：
- 最外层容器 → PageShell
- SCSS 删除 min-height/background 通用样式

apps/miniprogram/src/pages/article/detail/index.tsx

@@ -7,6 +7,7 @@ import { trackEvent } from '@/services/analytics';
 import { sanitizeHtml } from '@/utils/sanitize-html';
 import { useElderClass } from '../../../hooks/useElderClass';
 import { useAuthStore } from '../../../stores/auth';
+import PageShell from '@/components/ui/PageShell';
 import './index.scss';
 
 export default function ArticleDetail() {
@@ -44,26 +45,26 @@ export default function ArticleDetail() {
 
   if (loading) {
     return (
-      <View className={`article-detail-page ${modeClass}`}>
+      <PageShell className={modeClass}>
         <View className='loading-state'>
           <Text className='loading-text'>加载中...</Text>
         </View>
-      </View>
+      </PageShell>
     );
   }
 
   if (!article) {
     return (
-      <View className={`article-detail-page ${modeClass}`}>
+      <PageShell className={modeClass}>
         <View className='empty-state'>
           <Text className='empty-text'>文章不存在</Text>
         </View>
-      </View>
+      </PageShell>
     );
   }
 
   return (
-    <View className={`article-detail-page ${modeClass}`}>
+    <PageShell className={modeClass}>
       {/* 文章头部 */}
       <View className='article-header'>
         <Text className='article-title'>{article.title}</Text>
@@ -93,6 +94,6 @@ export default function ArticleDetail() {
           nodes={sanitizeHtml(article.content || '')}
         />
       </View>
-    </View>
+    </PageShell>
   );
 }