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/blog/page.tsx

@@ -10,9 +10,12 @@ import { apiUrl } from "@/lib/api-base";
 
 const LIMIT = 9;
 
+// Render at request time so the first page of posts is in the HTML for crawlers.
+export const dynamic = "force-dynamic";
+
 async function fetchJson<T>(path: string, fallback: T): Promise<T> {
   try {
-    const res = await fetch(apiUrl(path), { next: { revalidate: 300 } });
+    const res = await fetch(apiUrl(path), { cache: "no-store" });
     if (!res.ok) return fallback;
     return (await res.json()) as T;
   } catch {