fix(settings): fix 404 on /settings for root user on cloud instance

- Make Server property nullable in Settings components (Index, Advanced, Updates)
- Add conditional server loading: only load when not on cloud
- Add null checks before using server for DNS validation and proxy configuration
- Fix isInstanceAdmin() to check root team's pivot role directly instead of current team
- Make root team (id=0) bypass subscription check on cloud
- Remove isInstanceAdmin() from main middleware bypass: only settings/admin routes are exempted
- Update isSubscribed() to only check isSubscriptionActive() for navbar consistency

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

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

bootstrap/helpers/shared.php

@@ -384,7 +384,7 @@ function base_url(bool $withPort = true): string
 
 function isSubscribed()
 {
-    return isSubscriptionActive() || auth()->user()->isInstanceAdmin();
+    return isSubscriptionActive();
 }
 
 function isProduction(): bool