chore(query): utilize Helper::flatten for array string conversion

- Updated `group` and `order` key handling to use `Helper::flatten` for improved array-to-string conversion logic.

Author: jturbide

src/Mvc/Controller/Traits/Query.php

@@ -36,6 +36,7 @@
 use PhalconKit\Mvc\Controller\Traits\Query\Save;
 use PhalconKit\Mvc\Controller\Traits\Query\With;
 use PhalconKit\Mvc\Model\Interfaces\EagerLoadInterface;
+use PhalconKit\Support\Helper;
 
 /**
  * Class Query
@@ -210,7 +211,7 @@ public function prepareFind(?Collection $find = null, bool $ignoreKey = false):
 
         foreach (['group', 'order'] as $keyToJoin) {
             if (isset($build[$keyToJoin]) && is_array($build[$keyToJoin])) {
-                $build[$keyToJoin] = implode(', ', $build[$keyToJoin]);
+                $build[$keyToJoin] = implode(', ', Helper::flatten($build[$keyToJoin]));
             }
         }