feat(baoyu-url-to-markdown): vendor baoyu-fetch runtime

skills/baoyu-url-to-markdown/scripts/lib/adapters/x/match.ts

@@ -0,0 +1,9 @@
+export function isXHost(hostname: string): boolean {
+  return ["x.com", "www.x.com", "twitter.com", "www.twitter.com"].includes(hostname);
+}
+
+export function extractStatusId(url: URL): string | undefined {
+  const match = url.pathname.match(/\/(?:status|article)\/(\d+)/);
+  return match?.[1];
+}
+