fix(migration): use correct column names for system_config table

description → description_ar, add group_name (required non-null column)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/Phase_100_001_sports_wizard_refactor.php

@@ -43,9 +43,10 @@ return function (Database $db): void {
     );
     if (!$existing) {
         $db->insert('system_config', [
-            'config_key'   => 'sa.swimming.coach_manage',
-            'config_value' => '1',
-            'description'  => 'Swimming Coach Management permission flag',
+            'config_key'    => 'sa.swimming.coach_manage',
+            'config_value'  => '1',
+            'description_ar' => 'صلاحية إدارة مدربين السباحة',
+            'group_name'    => 'sports_activity',
         ]);
     }
 };