Refactor.

common/minimal-node.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+{
+  # Minimal base configuration for all NixOS systems
+  # Provides: SSH access, user management, boot, impermanence
+  # Note: unattended-encryption is NOT included by default - add it explicitly where needed
+  imports = [
+    ./impermanence.nix
+    ./sshd.nix
+    ./user-ppetru.nix
+    ./systemd-boot.nix
+  ];
+}