feat: rebrand to Domain Scanner platform

Replace GeoExport static site with Next.js domain intelligence app:
real DNS/WHOIS/SSL/HTTP/geo scans, SSE progress, Docker stack,
updated install/uninstall scripts, and full documentation.

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

src/app/settings/page.tsx

@@ -0,0 +1,11 @@
+export default function SettingsPage() {
+  return (
+    <div className="mx-auto max-w-2xl px-4 pb-24 pt-24">
+      <h1 className="text-4xl font-bold">Settings</h1>
+      <p className="mt-4 text-zinc-400">
+        Configure IPINFO_TOKEN, SCAN_RATE_LIMIT_PER_HOUR, and database URLs via environment
+        variables on your server. Theme toggle is in the header.
+      </p>
+    </div>
+  );
+}