feat: copy markdown files to output directory for download feature

Add build step to copy all .md files to dist directory to support direct markdown file access for download and copy features. Update sitemap generation to reflect recent changes and improve code formatting. The copy operation excludes special directories like .vitepress, public, and node_modules to ensure only documentation content is available for download.

scripts/generate-sitemap.mjs

@@ -16,7 +16,18 @@ const docsDir = path.resolve(__dirname, '../docs')
 const publicDir = path.resolve(__dirname, '../docs/public')
 
 // 支持的语言
-const locales = ['zh-cn', 'en', 'zh-tw', 'ja-jp', 'ko-kr', 'es-es', 'fr-fr', 'de-de', 'ar-sa', 'vi-vn']
+const locales = [
+  'zh-cn',
+  'en',
+  'zh-tw',
+  'ja-jp',
+  'ko-kr',
+  'es-es',
+  'fr-fr',
+  'de-de',
+  'ar-sa',
+  'vi-vn'
+]
 
 // 基础 URL (根据部署环境动态确定)
 const getBaseUrl = () => {
@@ -46,7 +57,12 @@ function scanMarkdownFiles(dir, basePath = '') {
 
     if (entry.isDirectory()) {
       // 跳过特殊目录
-      if (entry.name === '.vitepress' || entry.name === 'node_modules' || entry.name === 'dist' || entry.name === 'public') {
+      if (
+        entry.name === '.vitepress' ||
+        entry.name === 'node_modules' ||
+        entry.name === 'dist' ||
+        entry.name === 'public'
+      ) {
         continue
       }
       files.push(...scanMarkdownFiles(fullPath, relativePath))
@@ -152,7 +168,7 @@ function main() {
     baseFiles = scanMarkdownFiles(zhCnDir)
   } else {
     // 如果没有 zh-cn 目录，扫描 docs 根目录
-    baseFiles = scanMarkdownFiles(docsDir).filter(f => !f.includes('/'))
+    baseFiles = scanMarkdownFiles(docsDir).filter((f) => !f.includes('/'))
   }
 
   console.log(`📄 Found ${baseFiles} base pages`)
@@ -263,7 +279,7 @@ function getPriority(filePath) {
 function getHreflangCode(locale) {
   const map = {
     'zh-cn': 'zh-CN',
-    'en': 'en',
+    en: 'en',
     'zh-tw': 'zh-TW',
     'ja-jp': 'ja',
     'ko-kr': 'ko',