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.

docs/.vitepress/config.mjs

@@ -1239,6 +1239,34 @@ Sitemap: ${siteUrl}/sitemap.xml
       '✓ Generated robots.txt with sitemap URL:',
       `${siteUrl}/sitemap.xml`
     )
+
+    // Copy all .md files to dist for download/copy features
+    const srcDir = siteConfig.srcDir || path.resolve(outDir, '../../')
+    function copyMdFiles(src, dest) {
+      if (!fs.existsSync(dest)) {
+        fs.mkdirSync(dest, { recursive: true })
+      }
+      const entries = fs.readdirSync(src, { withFileTypes: true })
+      for (const entry of entries) {
+        const srcPath = path.join(src, entry.name)
+        const destPath = path.join(dest, entry.name)
+        if (entry.isDirectory()) {
+          if (
+            entry.name === '.vitepress' ||
+            entry.name === 'public' ||
+            entry.name === 'node_modules'
+          )
+            continue
+          copyMdFiles(srcPath, destPath)
+        } else if (entry.isFile() && entry.name.endsWith('.md')) {
+          fs.copyFileSync(srcPath, destPath)
+        }
+      }
+    }
+    console.log(
+      '✓ Copying markdown files to output directory for download feature...'
+    )
+    copyMdFiles(srcDir, outDir)
   },
 
   // 多语言配置 - 使用 cn/en-us/ja 结构

docs/.vitepress/theme/components/CopyOrDownloadAsMarkdownButtons/index.vue

@@ -50,7 +50,8 @@
 </template>
 
 <script setup>
-import { onMounted, onUnmounted, ref } from 'vue'
+import { onMounted, onUnmounted, ref, computed } from 'vue'
+import { useData } from 'vitepress'
 
 import iconChatGPT from './icons/chatgpt.svg?raw'
 import iconCheck from './icons/check.svg?raw'
@@ -61,7 +62,16 @@ import iconDownload from './icons/download.svg?raw'
 import iconExternal from './icons/external.svg?raw'
 import iconMarkdown from './icons/markdown.svg?raw'
 
-import { downloadFile, resolveMarkdownPageURL } from './utils'
+import { downloadFile } from './utils'
+
+const { page, site } = useData()
+
+const getMarkdownUrl = () => {
+	const origin = window.location.origin
+	let base = site.value.base || '/'
+	if (!base.endsWith('/')) base += '/'
+	return `${origin}${base}${page.value.filePath}`
+}
 
 const aiProviders = [
 	{ name: 'ChatGPT', icon: iconChatGPT, url: 'https://chatgpt.com/?hints=search&prompt=' },
@@ -98,10 +108,8 @@ function toggleDropdown() {
 	}
 }
 
-const currentURL = window.location.origin + window.location.pathname
-
 function copyAsMarkdown() {
-	fetch(resolveMarkdownPageURL(currentURL))
+	fetch(getMarkdownUrl())
 		.then((r) => r.text())
 		.then((text) => navigator.clipboard.writeText(text))
 		.then(() => {
@@ -116,22 +124,22 @@ function copyAsMarkdown() {
 }
 
 function viewAsMarkdown() {
-	window.open(resolveMarkdownPageURL(currentURL), '_blank')
+	window.open(getMarkdownUrl(), '_blank')
 	isOpen.value = false
 }
 
 function openInAI(provider) {
-	const markdownUrl = resolveMarkdownPageURL(currentURL)
+	const markdownUrl = getMarkdownUrl()
 	const prompt = `Read from ${markdownUrl} so I can ask questions about it.`
 	window.open(provider.url + encodeURIComponent(prompt), '_blank')
 	isOpen.value = false
 }
 
 function downloadMarkdown() {
-	fetch(resolveMarkdownPageURL(currentURL))
+	fetch(getMarkdownUrl())
 		.then((r) => r.text())
 		.then((text) => {
-			const filename = resolveMarkdownPageURL(currentURL).split('/').pop() || 'page.md'
+			const filename = page.value.filePath.split('/').pop() || 'page.md'
 			downloadFile(filename, text, 'text/markdown')
 			downloaded.value = true
 			setTimeout(() => {

docs/public/sitemap.xml

@@ -949,7 +949,7 @@
   </url>
   <url>
     <loc>https://datawhalechina.github.io/easy-vibe/zh-cn/stage-2/backend/2.6-modern-cli/</loc>
-    <lastmod>2026-03-18T07:59:13-05:00</lastmod>
+    <lastmod>2026-03-23T17:36:13+08:00</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.8</priority>
     <xhtml:link rel="alternate" hreflang="zh-CN" href="https://datawhalechina.github.io/easy-vibe/zh-cn/stage-2/backend/2.6-modern-cli/"/>
@@ -1056,7 +1056,7 @@
   </url>
   <url>
     <loc>https://datawhalechina.github.io/easy-vibe/zh-cn/stage-3/core-skills/basics/</loc>
-    <lastmod>2026-03-02T12:42:07+08:00</lastmod>
+    <lastmod>2026-03-23T17:36:13+08:00</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.8</priority>
     <xhtml:link rel="alternate" hreflang="zh-CN" href="https://datawhalechina.github.io/easy-vibe/zh-cn/stage-3/core-skills/basics/"/>