feat: add noStrudel Nostr client with NIP-07 iframe proxy support

Added nostrudel.ninja as a web-only app in Marketplace (community category).
Configured nginx reverse proxy at /ext/nostrudel/ with NIP-07 provider
injection in both HTTP and HTTPS blocks.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/stores/appLauncher.ts

@@ -17,6 +17,7 @@ const EXTERNAL_PROXY_PATH: Record<string, string> = {
   'botfights.net': '/ext/botfights/',
   '484.kitchen': '/ext/484-kitchen/',
   'present.l484.com': '/ext/arch-presentation/',
+  'nostrudel.ninja': '/ext/nostrudel/',
 }
 
 function mustOpenInNewTab(url: string): boolean {