fix: make sure caddy is not removed by cleanup

bootstrap/helpers/proxy.php

@@ -244,6 +244,7 @@ function generate_default_proxy_configuration(Server $server)
                     ],
                     'labels' => [
                         'coolify.managed=true',
+                        'coolify.proxy=true',
                     ],
                     'volumes' => [
                         '/var/run/docker.sock:/var/run/docker.sock:ro',