feat(docs): i18n config (zh-cn, ja)

Author: vishr

site/astro.config.mjs

@@ -10,6 +10,12 @@ export default defineConfig({
   integrations: [
     starlight({
       title: 'Echo',
+      defaultLocale: 'root',
+      locales: {
+        root: { label: 'English', lang: 'en' },
+        'zh-cn': { label: '简体中文', lang: 'zh-CN' },
+        ja: { label: '日本語', lang: 'ja' },
+      },
       logo: {
         light: './src/assets/logo-light.svg',
         dark: './src/assets/logo-dark.svg',
@@ -73,9 +79,9 @@ export default defineConfig({
       // Autogenerated from the content dirs — new pages appear automatically,
       // ordered by each page's `sidebar.order` frontmatter.
       sidebar: [
-        { label: 'Guide', items: [{ autogenerate: { directory: 'guide' } }] },
-        { label: 'Middleware', items: [{ autogenerate: { directory: 'middleware' } }] },
-        { label: 'Cookbook', items: [{ autogenerate: { directory: 'cookbook' } }] },
+        { label: 'Guide', translations: { 'zh-CN': '指南', ja: 'ガイド' }, items: [{ autogenerate: { directory: 'guide' } }] },
+        { label: 'Middleware', translations: { 'zh-CN': '中间件', ja: 'ミドルウェア' }, items: [{ autogenerate: { directory: 'middleware' } }] },
+        { label: 'Cookbook', translations: { 'zh-CN': '示例', ja: 'クックブック' }, items: [{ autogenerate: { directory: 'cookbook' } }] },
       ],
       // tune the built-in code theme toward our terminal palette
       expressiveCode: { themes: ['github-dark', 'github-light'] },