refactor(systemModules:nix): now enabled on all systems unless host is specified as a phone

system/modules/nix/nix/default.nix

@@ -0,0 +1,23 @@
+{ config, lib, inputs, ... }: 
+
+let
+  inherit (lib) mkIf;
+  host = config.systemModules.host;
+in
+
+{
+  config = mkIf (host.type != "phone") {
+    nix = {
+      settings = {
+        trusted-users = [ "root" "@wheel" ];
+        auto-optimise-store = lib.mkDefault true;
+        experimental-features = [ "nix-command" "flakes" "repl-flake" ];
+        warn-dirty = false;
+        system-features = [ "kvm" "big-parallel" "nixos-test" ];
+        flake-registry = "";
+      };
+      registry = lib.mapAttrs (_: value: { flake = value; }) inputs;
+      nixPath = [ "nixpkgs=${inputs.nixpkgs.outPath}" ];
+    }; 
+  };
+}