Integrations DI refactor, remove Sellasist/Baselinker, fix product-edit encoding (0.263)

- New: Domain\Integrations\IntegrationsRepository + admin\Controllers\IntegrationsController (DI)
- Cleanup: removed all Sellasist and Baselinker integrations from entire project
- Fix: product-edit.php Polish characters (UTF-8/CP1250 double-encoding)
- Update: factory\Integrations as facade (Apilo + ShopPRO only)
- Tests: 212 tests, 577 assertions

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

admin/templates/shop-statuses/status-edit.php

@@ -7,19 +7,6 @@ foreach ( $this -> apilo_order_status_list as $apilo_status )
 {
   $apilo_status_types_list[ $apilo_status['id'] ] = $apilo_status['name'];
 }
-// statusy sellasist
-$sellasist_status_types_list[''] = '--- wybierz status sellasist ---';
-foreach ( $this -> sellasist_status_types_list as $sellasist_status )
-{
-  $sellasist_status_types_list[ $sellasist_status['id'] ] = $sellasist_status['name'];
-}
-
-// baselinker order_status_list
-$baselinker_order_status_list[''] = '--- wybierz status baselinker ---';
-foreach ( $this -> baselinker_order_status_list as $baselinker_status )
-{
-  $baselinker_order_status_list[ $baselinker_status['id'] ] = $baselinker_status['name'];
-}
 ob_start();
 ?>
   <div id="settings-tabs">
@@ -49,22 +36,6 @@ ob_start();
           'values'  => $apilo_status_types_list,
           'value' => $this -> status['apilo_status_id']
         ] );?>
-        <!-- statust sellasist -->
-        <?= \Html::select( [
-          'label' => 'Status z Sellasist',
-          'name' => 'sellasist_status_id',
-          'id' => 'sellasist_status_id',
-          'values'  => $sellasist_status_types_list,
-          'value' => $this -> status['sellasist_status_id']
-        ] );?>
-        <!-- status baselinker -->
-        <?= \Html::select( [
-          'label' => 'Status z Baselinker',
-          'name' => 'baselinker_status_id',
-          'id' => 'baselinker_status_id',
-          'values'  => $baselinker_order_status_list,
-          'value' => $this -> status['baselinker_status_id']
-        ] );?>
       </div>
     </div>
   </div>