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/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(() => {