add boilerplate

modules/default.nix

@@ -1,4 +1,10 @@
-{ self, inputs, ... }: {
+{
+  self,
+  inputs,
+  config,
+  ...
+}:
+{
   flake.nixosConfigurations.nerv = inputs.nixpkgs.lib.nixosSystem {
     modules = with self.nixosModules; [
       user
@@ -7,5 +13,6 @@
       boot
       /etc/nixos/hardware-configuration.nix
     ];
+    config.dualBoot = true;
   };
 }

modules/system/core/boot.nix

@@ -1,5 +1,5 @@
-{ ... }: {
+{ lib, config, ... }: {
-  flake.nixosModules.boot = {
+  flake.nixosModules.boot = { config, ... }: {
     options = {
       dualBoot = lib.mkOption {
         type = lib.types.bool;
@@ -7,11 +7,11 @@
         description = "wether to enable windows boot entry to limine or not";
       };
     };
-    boot.loader = {
+    config.boot.loader = {
       efi.canTouchEfiVariables = true;
       limine = {
         enable = true;
-        extraEntries = lib.mkIf dualBoot ''
+        extraEntries = lib.mkIf config.dualBoot ''
           /Windows 11
            protocol: efi_boot_entry
            entry: Windows Boot Manager

modules/system/core/system.nix

@@ -0,0 +1,26 @@
+{ ... }: {
+  flake.nixosModules.base = {
+    time.timeZone = "Europe/Berlin";
+    i18n.defaultLocale = "en_US.UTF-8";
+    i18n.extraLocaleSettings = {
+      LC_ADDRESS = "de_DE.UTF-8";
+      LC_IDENTIFICATION = "de_DE.UTF-8";
+      LC_MEASUREMENT = "de_DE.UTF-8";
+      LC_MONETARY = "de_DE.UTF-8";
+      LC_NAME = "de_DE.UTF-8";
+      LC_NUMERIC = "de_DE.UTF-8";
+      LC_PAPER = "de_DE.UTF-8";
+      LC_TELEPHONE = "de_DE.UTF-8";
+      LC_TIME = "de_DE.UTF-8";
+    };
+    security = {
+      rtkit.enable = true;
+      polkit.enable = true; # polkit
+      polkit.enablePkexecWrapper = true;
+    };
+    nix.settings.experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+  };
+}

result

@@ -0,0 +1 @@
+/nix/store/dv2b9jwqaymcsdiw2sp81h3xqfnlkac7-nixos-system-nixos-26.05.20261015.26f4107