feat: Markdown 正文自动 TOC（锚点+折叠目录）+ 社交账号扩充国内平台（B站/小红书/抖音/视频号/公众号/其他）+ 侧边栏社交展示 + JSON-LD sameAs 全平台聚合 + 首页 h1（SEO 语义）

themes/sablog/views/show.blade.php

@@ -16,6 +16,20 @@
     @endif
 
     <article class="post-full">
+            @if(! empty($toc))
+                <nav class="toc" aria-label="文章目录">
+                    <details open>
+                        <summary>目录</summary>
+                        <ol class="toc-list">
+                            @foreach($toc as $item)
+                                <li class="toc-level-{{ $item['level'] }}">
+                                    <a href="#{{ $item['id'] }}">{{ $item['text'] }}</a>
+                                </li>
+                            @endforeach
+                        </ol>
+                    </details>
+                </nav>
+            @endif
         @if($cover = $post->getFirstMedia('cover'))
             <div class="post-cover"><img src="{{ $cover->getUrl('card') ?: $cover->getUrl() }}" alt="{{ $post->title }}"></div>
         @endif