Initial shared NixOS modules

system/default/system.nix

@@ -0,0 +1,15 @@
+{ ... }:
+{
+  # Environment package management
+  # Remove unnecessary default packages to keep system minimal
+  # Default packages usually include basic utilities that might not be needed
+  environment.defaultPackages = [ ];
+
+  # Clean up temporary files on every boot
+  # This prevents /tmp from accumulating old files and filling up
+  boot.tmp.cleanOnBoot = true;
+
+  # Disable coredumps to prevent filling up /var/lib/systemd/coredump/
+  # Coredumps can quickly consume large amounts of disk space
+  systemd.coredump.enable = false;
+}