feat : add contract end notice DTO

src/Service/Notification/ContractEndNotice.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Notification;
+
+final readonly class ContractEndNotice
+{
+    public function __construct(
+        public ?int $employeeId,
+        public string $message,
+    ) {}
+}