feat: add visible version debugPrint on app startup

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/main.dart

@@ -14,10 +14,7 @@ void main() async {
   // Use path-based URLs on web (no-op on mobile/desktop)
   configureUrlStrategy();
 
-  developer.log(
-    '${AppVersion.name} v${AppVersion.fullVersion}',
-    name: 'tatlock_ui',
-  );
+  debugPrint('🪣 ${AppVersion.name} v${AppVersion.fullVersion}');
 
   // Initialize auth before starting the app.
   // This handles OIDC callback and silent auth on web.