feat(places): submit place and outcode sitemaps

Separate children per family so Search Console reports the location layer's
indexation apart from the school pages' — which is the point of the index
built in W1, and the number the stop condition watches.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015mWQnpye9F299NVRCCSRvj

nextjs-app/app/sitemaps/[...parts]/route.ts

@@ -9,7 +9,7 @@ export const runtime = 'nodejs';
  * validated here rather than passed through, so this route cannot be used to
  * reach arbitrary backend paths.
  */
-const CHILD = /^(static|schools-\d+)\.xml$/;
+const CHILD = /^(static|schools-\d+|places-\d+|outcodes-\d+)\.xml$/;
 
 export async function GET(
   _request: Request,