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/page.tsx

@@ -12,11 +12,13 @@ interface FaqItem {
   showOnHomepage: boolean;
 }
 
+// Render at request time from the live backend so the Q&A and FAQPage JSON-LD
+// are always present in the HTML for crawlers, never a build-time-empty shell.
+export const dynamic = "force-dynamic";
+
 async function fetchFaqs(): Promise<FaqItem[]> {
   try {
-    const res = await fetch(apiUrl("/faqs?all=true"), {
-      next: { revalidate: 300 },
-    });
+    const res = await fetch(apiUrl("/faqs?all=true"), { cache: "no-store" });
     if (!res.ok) return [];
     const data = await res.json();
     return Array.isArray(data) ? data : [];