v2.2: Fix critical npub scope bug + relay update + enhanced debugging

- Fixed critical npub variable scope issue in submitAuthToBackend() that was causing 'Connecting...' hang
- Added relay.laantungir.net to NOSTR_RELAYS (first priority)
- Enhanced error handling with input validation and 30s timeout
- Added comprehensive debug logging for form submission
- Updated version displays to v2.2 throughout
- Improved error messages and user feedback

app.js

@@ -19,6 +19,7 @@ const CLIENT_SECRET = 'gitea-secret';
 
 // Nostr relays for fetching user metadata
 const NOSTR_RELAYS = [
+  'wss://relay.laantungir.net',
   'wss://relay.damus.io',
   'wss://nos.lol',
   'wss://relay.nostr.band',