feat: support fumadocs

web/app/components/language-switcher.tsx

@@ -0,0 +1,23 @@
+import { LanguagesIcon } from "lucide-react";
+import { useTranslation } from "react-i18next";
+import { Button } from "./ui/button";
+
+export function LanguageSwitcher() {
+  const { i18n } = useTranslation();
+
+  const toggleLanguage = () => {
+    const newLang = i18n.language === "en" ? "zh-CN" : "en";
+    i18n.changeLanguage(newLang);
+  };
+
+  return (
+    <Button
+      variant="ghost"
+      size="icon"
+      onClick={toggleLanguage}
+      title={i18n.language === "en" ? "Switch to Chinese" : "切换到英文"}
+    >
+      <LanguagesIcon className="h-5 w-5" />
+    </Button>
+  );
+}