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>

autoload/admin/controls/class.ShopTransport.php

@@ -8,7 +8,7 @@ class ShopTransport
     $values = json_decode( \S::get( 'values' ), true );
 
     if ( $id = \admin\factory\ShopTransport::transport_save(
-            $values['id'], $values['name'], $values['name_visible'], $values['description'], $values['status'], $values['cost'], $values['payment_methods'], $values['max_wp'], $values['default'], $values['apilo_carrier_account_id'], $values['sellasist_shipment_method_id'], $values['delivery_free']
+            $values['id'], $values['name'], $values['name_visible'], $values['description'], $values['status'], $values['cost'], $values['payment_methods'], $values['max_wp'], $values['default'], $values['apilo_carrier_account_id'], $values['delivery_free']
           ) )
       $response = [ 'status' => 'ok', 'msg' => 'Rodzaj transportu został zapisany.', 'id' => $id ];
 
@@ -22,7 +22,6 @@ class ShopTransport
       'transport_details' => \admin\factory\ShopTransport::transport_details( \S::get( 'id' ) ),
       'payments_list'     => \admin\factory\ShopPaymentMethod::payments_list(),
       'apilo_carrier_account_list' => unserialize( \admin\factory\Integrations::apilo_settings( 'carrier-account-list' ) ),
-      'sellasist_shipments_methods' => unserialize( \admin\factory\Integrations::sellasist_settings( 'shipments_methods' ) ),
     ] );
   }
 
@@ -30,7 +29,6 @@ class ShopTransport
   {
     return \Tpl::view( 'shop-transport/view-list', [
       'apilo_carrier_account_list' => unserialize( \admin\factory\Integrations::apilo_settings( 'carrier-account-list' ) ),
-      'sellasist_shipments_methods' => unserialize( \admin\factory\Integrations::sellasist_settings( 'shipments_methods' ) ),
     ] );
   }
 }