refactor(di): replace end() with array_last()

src/Framework/DI/Exceptions/CyclicDependencyException.php

@@ -64,8 +64,8 @@ final class CyclicDependencyException extends ContainerException
     private function buildMessage(): string
     {
         $cycleStr = implode(' → ', $this->cycle);
-        $fullChain = $this->fullChain;
-        $requestedClass = end($fullChain);
+
+        $requestedClass = array_last($this->fullChain);
 
         // Prüfe ob Initializer-Zyklus vorliegt
         $initializerInfo = $this->detectInitializerCycle();