fix(frontend): 完善Markdown与Chat事件渲染

frontend/src/utils/markdown.ts

@@ -0,0 +1,9 @@
+import DOMPurify from 'dompurify'
+import { marked } from 'marked'
+
+marked.setOptions({ gfm: true, breaks: true })
+
+export function renderMarkdown(source: string): string {
+  const html = marked.parse(source, { async: false }) as string
+  return DOMPurify.sanitize(html, { USE_PROFILES: { html: true } })
+}