feat(i18n): add zh-CN UI translations and sidebar labels

- Add website/src/content/i18n/zh-CN.json with Starlight UI strings
- Add sidebar group label translations (欢迎, 路线图, 教程, etc.)
- Register i18n collection in content config to fix deprecation warning

website/astro.config.mjs

@@ -102,25 +102,29 @@ export default defineConfig({
 
       // Sidebar configuration (Diataxis structure)
       sidebar: [
-        { label: 'Welcome', slug: 'index' },
-        { label: 'Roadmap', slug: 'roadmap' },
+        { label: 'Welcome', translations: { 'zh-CN': '欢迎' }, slug: 'index' },
+        { label: 'Roadmap', translations: { 'zh-CN': '路线图' }, slug: 'roadmap' },
         {
           label: 'Tutorials',
+          translations: { 'zh-CN': '教程' },
           collapsed: false,
           autogenerate: { directory: 'tutorials' },
         },
         {
           label: 'How-To Guides',
+          translations: { 'zh-CN': '操作指南' },
           collapsed: true,
           autogenerate: { directory: 'how-to' },
         },
         {
           label: 'Explanation',
+          translations: { 'zh-CN': '概念说明' },
           collapsed: true,
           autogenerate: { directory: 'explanation' },
         },
         {
           label: 'Reference',
+          translations: { 'zh-CN': '参考' },
           collapsed: true,
           autogenerate: { directory: 'reference' },
         },

website/src/content/config.ts

@@ -1,6 +1,7 @@
 import { defineCollection } from 'astro:content';
-import { docsSchema } from '@astrojs/starlight/schema';
+import { docsSchema, i18nSchema } from '@astrojs/starlight/schema';
 
 export const collections = {
   docs: defineCollection({ schema: docsSchema() }),
+  i18n: defineCollection({ type: 'data', schema: i18nSchema() }),
 };

website/src/content/i18n/zh-CN.json

@@ -0,0 +1,28 @@
+{
+  "skipLink.label": "跳转到内容",
+  "search.label": "搜索",
+  "search.ctrlKey": "Ctrl",
+  "search.cancelLabel": "取消",
+  "themeSelect.accessibleLabel": "选择主题",
+  "themeSelect.dark": "深色",
+  "themeSelect.light": "浅色",
+  "themeSelect.auto": "自动",
+  "languageSelect.accessibleLabel": "选择语言",
+  "menuButton.accessibleLabel": "菜单",
+  "sidebarNav.accessibleLabel": "主导航",
+  "tableOfContents.onThisPage": "本页内容",
+  "tableOfContents.overview": "概述",
+  "i18n.untranslatedContent": "此内容尚未提供中文翻译。",
+  "page.editLink": "编辑页面",
+  "page.lastUpdated": "最后更新：",
+  "page.previousLink": "上一页",
+  "page.nextLink": "下一页",
+  "page.draft": "此内容为草稿，不会包含在正式版本中。",
+  "404.text": "页面未找到。请检查 URL 或尝试使用搜索。",
+  "aside.note": "注意",
+  "aside.tip": "提示",
+  "aside.caution": "警告",
+  "aside.danger": "危险",
+  "fileTree.directory": "目录",
+  "builtWithStarlight.label": "使用 Starlight 构建"
+}