chore: import upstream snapshot with attribution

apps/docs/app/llms.mdx/[[...slug]]/route.ts

@@ -0,0 +1,35 @@
+import { notFound } from 'next/navigation'
+import { type NextRequest, NextResponse } from 'next/server'
+import { i18n } from '@/lib/i18n'
+import { getLLMText } from '@/lib/llms'
+import { source } from '@/lib/source'
+
+export const revalidate = false
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ slug?: string[] }> }
+) {
+  const { slug } = await params
+
+  let lang: (typeof i18n.languages)[number] = i18n.defaultLanguage
+  let pageSlug = slug
+
+  if (slug && slug.length > 0 && i18n.languages.includes(slug[0] as typeof lang)) {
+    lang = slug[0] as typeof lang
+    pageSlug = slug.slice(1)
+  }
+
+  const page = source.getPage(pageSlug, lang)
+  if (!page) notFound()
+
+  return new NextResponse(await getLLMText(page), {
+    headers: {
+      'Content-Type': 'text/markdown',
+    },
+  })
+}
+
+export function generateStaticParams() {
+  return source.generateParams()
+}