add claude code

lib/mkNixosSystem.nix

@@ -1,4 +1,13 @@
-{ self, nixpkgs, home-manager, nix-flatpak, plasma-manager, lanzaboote, ... }:
+{
+  self,
+  nixpkgs,
+  home-manager,
+  nix-flatpak,
+  plasma-manager,
+  lanzaboote,
+  claude-code,
+  ...
+}:
 hardwareConfig: hostConfig:
 
 nixpkgs.lib.nixosSystem {
@@ -8,6 +17,13 @@ nixpkgs.lib.nixosSystem {
     inherit plasma-manager;
   };
   modules = [
+    {
+      nixpkgs.overlays = [ claude-code.overlays.default ];
+      nix.settings = {
+        substituters = [ "https://claude-code.cachix.org" ];
+        trusted-public-keys = [ "claude-code.cachix.org-1:YeXf2aNu7UTX8Vwrze0za1WEDS+4DuI2kVeWEE4fsRk=" ];
+      };
+    }
     lanzaboote.nixosModules.lanzaboote
     hardwareConfig
     home-manager.nixosModules.home-manager