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）

app/Blog/Controllers/PostController.php

@@ -32,9 +32,14 @@ class PostController extends Controller
             ->orderBy('created_at', (int) blog_setting('comment_order', 1) === 1 ? 'asc' : 'desc')
             ->paginate(20);
 
-        $contentHtml = $this->renderer->render($post);
+        $rendered = $this->renderer->renderWithToc($post);
 
-        return theme_view('show', compact('post', 'comments', 'contentHtml'));
+        return theme_view('show', [
+            'post' => $post,
+            'comments' => $comments,
+            'contentHtml' => $rendered['html'],
+            'toc' => $rendered['toc'],
+        ]);
     }
 
     private function ensureReadable(Post $post): void