feat(docs): 添加中英文国际化支持

docs/.vitepress/i18n/index.ts

@@ -0,0 +1,21 @@
+import en from './en.json'
+import zh from './zh.json'
+
+export const messages = { en, zh }
+
+export type Locale = 'en' | 'zh'
+
+export function getLocaleMessages(locale: Locale) {
+  return messages[locale] || messages.en
+}
+
+// Helper to get nested key value
+export function t(messages: typeof en, key: string): string {
+  const keys = key.split('.')
+  let result: any = messages
+  for (const k of keys) {
+    result = result?.[k]
+    if (result === undefined) return key
+  }
+  return result
+}