Refactor product loading logic and update URL routing

- Refactored the product loading logic in the ShopProduct class to improve performance and readability.
- Updated the URL routing in the index.php file to handle redirects and routes based on the request URI.
- Added a new method in the S class to check if adding a redirect will create a cycle in the redirect map.
- Updated the S class to use the new method for adding redirects and generating URL routes.
- Removed unnecessary code related to generating .htaccess rules.

autoload/admin/controls/class.ShopProduct.php

@@ -276,8 +276,7 @@ class ShopProduct
     $response = [ 'status' => 'error', 'msg' => 'Podczas ładowania produktów wystąpił błąd. Proszę spróbować ponownie.' ];
 
     \S::set_session( 'products_list_current_page', \S::get( 'current_page' ) );
-    if ( \S::get( 'query' ) )
-      \S::set_session( 'products_list_query', \S::get( 'query' ) );
+    \S::set_session( 'products_list_query', \S::get( 'query' ) );
 
     if ( $products = \admin\factory\ShopProduct::ajax_products_list( \S::get_session( 'products_list_current_page' ), \S::get_session( 'products_list_query' ) ) ) {
       $response = [
@@ -313,12 +312,9 @@ class ShopProduct
       parse_str( $query, $query_array );
     }
 
-    if ( \S::get( 'show_xml_data' ) === 'true' )
-    {
+    if ( \S::get( 'show_xml_data' ) === 'true' ) {
       \S::set_session( 'show_xml_data', true );
-    }
-    else if ( \S::get( 'show_xml_data' ) === 'false' )
-    {
+    } else if ( \S::get( 'show_xml_data' ) === 'false' ) {
       \S::set_session( 'show_xml_data', false );
     }