feat(frontend): Shiki 白名单语言高亮并支持 aardio

显式加载常用语言；修复 pretty-code 去 shiki class 导致不上色，以及 aardio 循环别名。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/components/markdown/MdCodeBlock.tsx

@@ -136,18 +136,11 @@ export default function MdCodeBlock({ children, className, ...rest }: MdCodeBloc
     let cancelled = false;
     (async () => {
       try {
-        const { codeToHtml } = await import("shiki");
-        const html = await codeToHtml(plainText.replace(/\n$/, ""), {
-          lang: lang === "text" ? "plaintext" : lang,
-          themes: {
-            light: "github-light",
-            dark: "github-dark-dimmed",
-          },
-          defaultColor: false,
-        });
+        const { siteCodeToHtml } = await import("./shikiHighlighter");
+        const html = await siteCodeToHtml(plainText.replace(/\n$/, ""), lang);
         if (!cancelled) setClientHtml(html);
       } catch {
-        // 未知语言：保持纯文本
+        // 未知语言 / 加载失败：保持纯文本
       }
     })();
     return () => {
@@ -185,7 +178,7 @@ export default function MdCodeBlock({ children, className, ...rest }: MdCodeBloc
     }
   };
 
-  const preClass = ["md-code-pre", className].filter(Boolean).join(" ");
+  const preClass = ["md-code-pre", "shiki", className].filter(Boolean).join(" ");
 
   return (
     <div className="md-code-block" ref={rootRef}>