feat: update workstation services and tools

system/core/greeter.nix

@@ -62,7 +62,7 @@ in
       rosePineHyprcursor
     ];
 
-    programs.regreet = {
+    services.displayManager.regreet = {
       # greetd を Hyprland で動かす
       enable = true;
       theme.name = "Adwaita-dark";

system/home-manager/default.nix

@@ -1,11 +1,17 @@
+{ config, ... }:
 {
   imports = [
     ./theme-switcher.nix
   ];
 
-    home.activation = {
-        makedir = ''
-            mkdir -p ~/.config/cornflake
-        '';
-      };
+  programs.nh = {
+    enable = true;
+    flake = "${config.home.homeDirectory}/cornflake";
+  };
+
+  home.activation = {
+    makedir = ''
+      mkdir -p ~/.config/cornflake
+    '';
+  };
 }