✨ Moved yubikey config to security dir and rename

shared/modules/security/yubikey.nix

@@ -0,0 +1,32 @@
+# Yubikey config: https://nixos.wiki/wiki/Yubikey#pam_u2f
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    gnupg
+    yubioath-flutter # GUI
+  ];
+
+  programs.gnupg.agent.enable = true;
+
+  security = {
+    pam = {
+      services = {
+        login.u2fAuth = false; # U2F and password
+        sudo.u2fAuth = true; # U2F or password
+      };
+      u2f = {
+        enable = true;
+        settings = {
+          cue = true; # Prompt: Please touch the device
+          interactive = false; # Prompt: Insert your U2F device, then press ENTER.
+        };
+      };
+    };
+  };
+
+  services = {
+    pcscd.enable = true; # Required for Yubikey
+    udev.packages = with pkgs; [ yubikey-personalization ];
+  };
+}