feat(docs): enhance documentation site with internationalization and layout updates

- Updated the demo API to support locale-based content rendering.
- Refactored the main layout to accommodate language-specific metadata and routing.
- Introduced new components for blog and documentation pages, ensuring proper language handling.
- Added styles for improved UI consistency across different sections.
- Removed deprecated layout files and streamlined the structure for better maintainability.

apps/docs/app/[lang]/layout.tsx

@@ -0,0 +1,50 @@
+import { RootProvider } from 'fumadocs-ui/provider/next';
+import { i18nProvider } from 'fumadocs-ui/i18n';
+import { notFound } from 'next/navigation';
+import type { Metadata } from 'next';
+import { htmlLang, i18n, isLanguage } from '@/lib/i18n';
+import { translations } from '@/lib/layout.shared';
+import '../global.css';
+
+const siteUrl = process.env.NEXT_PUBLIC_SITE_URL ?? 'https://docs.leokun.cn';
+
+export async function generateMetadata(props: LayoutProps<'/[lang]'>): Promise<Metadata> {
+  const { lang } = await props.params;
+
+  if (lang === 'en') {
+    return {
+      metadataBase: new URL(siteUrl),
+      title: {
+        default: 'cursor-byok Docs',
+        template: '%s | cursor-byok',
+      },
+      description: 'Installation, model configuration, and troubleshooting guide for cursor-byok.',
+    };
+  }
+
+  return {
+    metadataBase: new URL(siteUrl),
+    title: {
+      default: 'cursor-byok 文档',
+      template: '%s | cursor-byok',
+    },
+    description: 'cursor-byok 的安装、模型配置与故障排查指南。',
+  };
+}
+
+export function generateStaticParams() {
+  return i18n.languages.map((lang) => ({ lang }));
+}
+
+export default async function Layout({ params, children }: LayoutProps<'/[lang]'>) {
+  const { lang } = await params;
+  if (!isLanguage(lang)) notFound();
+
+  return (
+    <html lang={htmlLang[lang]} suppressHydrationWarning>
+      <body className="flex min-h-screen flex-col">
+        <RootProvider i18n={i18nProvider(translations, lang)}>{children}</RootProvider>
+      </body>
+    </html>
+  );
+}