refactor: move max into dentritic pattern

modules/common/features/yubikey.nix

@@ -0,0 +1,32 @@
+{ ... }: {
+  flake.nixosModules.commonFeatureYubikey = { pkgs, ... }: {
+    environment.systemPackages = with pkgs; [
+        yubioath-flutter # gui
+        yubikey-manager  # `ykman`
+        pam_u2f          # yubikey with sudo
+    ];
+
+    services.pcscd.enable = true;
+    services.udev.packages = [ pkgs.yubikey-personalization ];
+
+    services.yubikey-agent.enable = true;
+
+    security.pam = {
+      sshAgentAuth.enable = true;
+      u2f = {
+        enable = true;
+        settings = {
+          cue = true;
+          authFile = "/home/max/.config/Yubico/u2f_keys";
+        };
+      };
+      services = {
+        login.u2fAuth = true;
+        sudo = {
+          u2fAuth = true;
+          sshAgentAuth = true;
+        };
+      };
+    };
+  };
+}