Added nixos configs

OLD CONFIGS/nix_new/modules/nixos/services/sshd.nix

@@ -0,0 +1,18 @@
+# SSH client only (no server).
+# - Installs OpenSSH client tools (ssh, scp, sftp, ssh-keygen, etc.)
+# - Enables ssh-agent for user sessions
+
+{ config, lib, pkgs, ... }:
+
+{
+  # Install the OpenSSH client tools
+  environment.systemPackages = with pkgs; [
+    #openssh
+  ];
+
+  # Start ssh-agent automatically for users (handy baseline)
+  programs.ssh.startAgent = true;
+
+  # Explicitly ensure the SSH server is NOT enabled
+  services.openssh.enable = false;
+}