✨ **Add public API documentation access and navigation links**

- 📚 Added "API Dokumentation" link to the sidebar and header navigation.
- 🔓 Defined `viewApiDocs` gate for public access to API documentation.
- ✅ Added feature tests for API documentation route accessibility and OpenAPI document serving.

app/Providers/AppServiceProvider.php

@@ -10,6 +10,7 @@ use Illuminate\Foundation\Events\DiagnosingHealth;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Facades\Event;
+use Illuminate\Support\Facades\Gate;
 use Illuminate\Support\Facades\RateLimiter;
 use Illuminate\Support\Facades\Route;
 use Illuminate\Support\Facades\URL;
@@ -37,6 +38,8 @@ class AppServiceProvider extends ServiceProvider
     {
         $this->configureRateLimiting();
 
+        Gate::define('viewApiDocs', fn (?Authenticatable $user = null): bool => true);
+
         if ($this->app->environment('production')) {
             URL::forceScheme('https');
         }