feat: resolve live Nostr references in blog posts and add embeds

Support naddr/nevent/note slugs for unindexed posts, cache naddr lookups,
render Nostr embeds in markdown, and add a consistency check for events mirrors.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/faq.md/route.ts

@@ -1,6 +1,6 @@
 import { buildFaqMarkdown } from "@/lib/llms";
 
-export const revalidate = 300;
+export const dynamic = "force-dynamic";
 
 export async function GET() {
   const body = await buildFaqMarkdown();