Roles via Nextcloud groups: sms-admin/manager/viewer + fix OAuth instance_uri

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

app/Filament/User/Resources/PackingResource.php

@@ -2,6 +2,7 @@
 
 namespace App\Filament\User\Resources;
 
+use App\Traits\EnforcesRoles;
 use App\Filament\User\Resources\PackingResource\Pages;
 use App\Filament\User\Resources\PackingResource\RelationManagers;
 use App\Models\Packing;
@@ -15,6 +16,7 @@ use Illuminate\Database\Eloquent\SoftDeletingScope;
 
 class PackingResource extends Resource
 {
+    use EnforcesRoles;
     protected static ?string $model = Packing::class;
     protected static ?string $navgationLabel = 'Verpackung & Größe';
     protected static ?string $modelLabel = 'Verpackung & Größe';