refactor: initialize $files

To suppress PHPStan error.

Author: kenjis

system/Commands/Utilities/Routes/ControllerFinder.php

@@ -44,6 +44,7 @@ public function find(): array
         $nsArray = explode('\\', trim($this->namespace, '\\'));
         $count   = count($nsArray);
         $ns      = '';
+        $files   = [];
 
         for ($i = 0; $i < $count; $i++) {
             $ns .= '\\' . array_shift($nsArray);