feat(llm-docs): add alternate link tags for llms.txt and .md routes

Add <link rel="alternate"> tags to HTML head for LLM-friendly document
discovery on homepage, org pages, and package pages.

Author: lukeocodes

app/pages/index.vue

@@ -10,6 +10,10 @@ async function search() {
 
 const { env } = useAppConfig().buildInfo
 
+useHead({
+  link: [{ key: 'llms-txt', rel: 'alternate', href: '/llms.txt', title: 'LLMs.txt' }],
+})
+
 useSeoMeta({
   title: () => $t('seo.home.title'),
   ogTitle: () => $t('seo.home.title'),

app/pages/org/[org].vue

@@ -129,7 +129,15 @@ const activeTab = shallowRef<'members' | 'teams'>('members')
 const canonicalUrl = computed(() => `https://npmx.dev/@${orgName.value}`)
 
 useHead({
-  link: [{ rel: 'canonical', href: canonicalUrl }],
+  link: [
+    { rel: 'canonical', href: canonicalUrl },
+    {
+      key: 'llms-txt',
+      rel: 'alternate',
+      href: () => `/package/@${orgName.value}/llms.txt`,
+      title: 'LLMs.txt',
+    },
+  ],
 })
 
 useSeoMeta({

app/pages/package/[[org]]/[name].vue

@@ -669,7 +669,30 @@ const compactNumberFormatter = useCompactNumberFormatter()
 const bytesFormatter = useBytesFormatter()
 
 useHead({
-  link: [{ rel: 'canonical', href: canonicalUrl }],
+  link: computed(() => {
+    const base = `/package/${packageName.value}`
+    const versionSegment = requestedVersion.value ? `/v/${requestedVersion.value}` : ''
+    const links: Array<{ key?: string; rel: string; href: string; title?: string }> = [
+      { rel: 'canonical', href: canonicalUrl.value },
+      {
+        key: 'llms-txt',
+        rel: 'alternate',
+        href: `${base}${versionSegment}/llms.txt`,
+        title: 'LLMs.txt',
+      },
+      {
+        key: 'llms-full-txt',
+        rel: 'alternate',
+        href: `${base}${versionSegment}/llms-full.txt`,
+        title: 'LLMs-full.txt',
+      },
+    ]
+    // .md routes only support latest version (no /v/ variant)
+    if (!requestedVersion.value) {
+      links.push({ key: 'pkg-md', rel: 'alternate', href: `${base}.md`, title: 'Markdown version' })
+    }
+    return links
+  }),
 })
 
 useSeoMeta({