feat: 代码片段功能与 Markdown 内嵌片段渲染、文档截图等

frontend/components/MarkdownBody.tsx

@@ -9,6 +9,7 @@ import MdTimeline from "@/components/markdown/MdTimeline";
 import MdEntries from "@/components/markdown/MdEntries";
 import MdDetails from "@/components/markdown/MdDetails";
 import MdVideo from "@/components/markdown/MdVideo";
+import MdSnippet from "@/components/markdown/MdSnippet";
 
 type MarkdownBodyProps = {
   content: string;
@@ -92,6 +93,10 @@ export default async function MarkdownBody({
       nodes.push(<MdVideo key={`video-${i}`} provider={seg.provider} id={seg.id} />);
       continue;
     }
+    if (seg.type === "snippet") {
+      nodes.push(<MdSnippet key={`snippet-${i}`} id={seg.id} />);
+      continue;
+    }
     const kind = seg.kind as HideKind;
     if (seg.locked) {
       nodes.push(