fix(mp): 健康页滚动卡死 + 文章样式丢失 — ScrollView height:0 修复 + RichArticle 18 条 tag-style 规则

- 健康页：移除冗余"健康"标题栏，ScrollView scrollY 添加 height:0 修复 flex 高度分配
- 健康页：useReachBottom(页面级)替换为 ScrollView onScrollToLower，修复模拟器卡死
- RichArticle：新增 18 条 tag-style 规则（h1-h4/p/ul/ol/li/table/th/td 等），确保文章内容在小程序中正确渲染样式

apps/miniprogram/src/components/RichArticle/index.tsx

@@ -7,6 +7,28 @@ interface RichArticleProps {
   className?: string;
 }
 
+const TAG_STYLE = JSON.stringify({
+  h1: 'font-size:20px;font-weight:700;color:#2D2A26;margin:16px 0 8px',
+  h2: 'font-size:18px;font-weight:700;color:#2D2A26;margin:16px 0 8px',
+  h3: 'font-size:16px;font-weight:700;color:#2D2A26;margin:16px 0 8px',
+  h4: 'font-size:15px;font-weight:600;color:#2D2A26;margin:12px 0 6px',
+  p: 'font-size:16px;color:#2D2A26;line-height:1.85;margin-bottom:12px',
+  ul: 'padding-left:20px;margin:8px 0;font-size:16px;line-height:1.9;color:#2D2A26',
+  ol: 'padding-left:20px;margin:8px 0;font-size:16px;line-height:1.9;color:#2D2A26',
+  li: 'margin-bottom:4px',
+  blockquote: 'border-left:3px solid #C4623A;padding:6px 12px;color:#5A554F;margin:12px 0',
+  strong: 'font-weight:700;color:#2D2A26',
+  em: 'font-style:italic',
+  code: 'background:#F5F0EB;padding:2px 6px;border-radius:4px;font-size:14px;color:#C4623A',
+  pre: 'background:#F5F0EB;padding:12px;border-radius:8px;margin:14px 0;overflow-x:auto',
+  table: 'width:100%;border-collapse:collapse;margin:8px 0;font-size:14px',
+  th: 'border:1px solid #E8E2DC;padding:6px 8px;background:#FAF8F5;font-weight:600;text-align:left',
+  td: 'border:1px solid #E8E2DC;padding:6px 8px',
+  hr: 'border:none;border-top:1px dashed #D1D5DB;margin:14px 0',
+  img: 'max-width:100%;border-radius:8px;margin:8px 0;display:block',
+  a: 'color:#C4623A;text-decoration:none',
+});
+
 function prepareHtml(raw: string): string {
   return sanitizeHtml(raw);
 }
@@ -23,7 +45,7 @@ function RichArticle({ html, className }: RichArticleProps) {
         lazy-load
         selectable
         container-style="font-size:16px;color:#5A554F;line-height:1.8;word-break:break-word"
-        tag-style='{"img":"max-width:100%;border-radius:8px;margin:12px auto;display:block","a":"color:#C4623A;text-decoration:none"}'
+        tag-style={TAG_STYLE}
       />
     </View>
   );