🐛 filter llms-full.txt to single locale via ?lang= query param

Default to en so LLM consumers get a single-language document.
Other locales available via /llms-full.txt?lang=zh etc.

https://claude.ai/code/session_01UwMuBPaeouJ16zJTVa8UJm

Author: claude

docs/app/llms-full.txt/route.ts

@@ -1,10 +1,13 @@
-import { getLLMText, source } from '@/lib/source';
+import { getLLMText, source } from "@/lib/source";
+import { i18n } from "@/lib/i18n";
+import { type NextRequest } from "next/server";
 
 export const revalidate = false;
 
-export async function GET() {
-  const scan = source.getPages().map(getLLMText);
-  const scanned = await Promise.all(scan);
+export async function GET(req: NextRequest) {
+  const lang = req.nextUrl.searchParams.get("lang") ?? i18n.defaultLanguage;
+  const pages = source.getPages(lang);
+  const scanned = await Promise.all(pages.map(getLLMText));
 
-  return new Response(scanned.join('\n\n'));
+  return new Response(scanned.join("\n\n"));
 }