feat(nixos): enable X13Gen2 configuration and improve service setup

- Activated the X13Gen2 configuration in `flake.nix`
- Fixed `home-manager` module references in `hosts/X13Gen2/default.nix`
- Moved `pulseaudio` configuration to `services.nix` for better organization
- Refactored `displayManager` for clarity and consistency

Author: takeokunn

flake.nix

@@ -65,7 +65,7 @@
           OPL2212-2 = import ./hosts/OPL2212-2 { inherit inputs; };
         };
         nixosConfigurations = {
-          # X13Gen2 = import ./hosts/X13Gen2 { inherit inputs; };
+          X13Gen2 = import ./hosts/X13Gen2 { inherit inputs; };
         };
         nixOnDroidConfigurations = {
           OPPO-A79 = import ./hosts/OPPO-A79 { inherit inputs; };

hosts/X13Gen2/default.nix

@@ -19,9 +19,9 @@ nixpkgs.lib.nixosSystem {
     home-manager.nixosModules.home-manager
     {
       home-manager.useUserPackages = true;
-      sharedModules = [ sops-nix.homeManagerModules.sops ];
+      home-manager.sharedModules = [ sops-nix.homeManagerModules.sops ];
       home-manager.users."${username}" = import ../../home-manager/advanced.nix;
-      extraSpecialArgs = {
+      home-manager.extraSpecialArgs = {
         inherit system;
         inherit (inputs) nixpkgs;
         inherit (inputs) mcp-servers-nix;

nixos/config/hardware.nix

@@ -1,6 +1,5 @@
 {
   hardware = {
-    pulseaudio.enable = false;
     bluetooth.enable = true;
   };
 }

nixos/config/services.nix

@@ -14,14 +14,18 @@
     xserver = {
       enable = true;
       xkb.layout = "jp";
-      displayManager.gdm.enable = true;
     };
 
-    displayManager.autoLogin = {
-      enable = true;
-      user = username;
+    displayManager = {
+      gdm.enable = true;
+      autoLogin = {
+        enable = true;
+        user = username;
+      };
     };
 
+    pulseaudio.enable = false;
+
     pipewire = {
       enable = true;
       alsa = {