chore(swarm): mark docker swarm as deprecated

config/deprecations.php

@@ -0,0 +1,5 @@
+<?php
+
+return [
+    'swarm' => 'Docker Swarm is deprecated and will be removed in Coolify v5. Coolify v5 will be replacing Swarm with native Docker Compose replicas and our own scaling solution. Existing Swarm deployments will continue to work on v4 as-is. We do not recommend setting up new Swarm deployments for the time being.',
+];