init by ai

nixos/default.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, pkgs-unstable, ... }:
+
+{
+  imports = [
+    ./modules/system.nix
+    ./modules/development.nix
+    ./modules/shell.nix
+  ];
+
+  # ============================================
+  # Shared NixOS Configuration
+  # ============================================
+
+  # System packages available to all users
+  environment.systemPackages = with pkgs; [
+    git
+    curl
+    wget
+    vim
+    htop
+  ];
+
+  # Nix settings
+  nix = {
+    settings = {
+      experimental-features = [ "nix-command" "flakes" ];
+      auto-optimise-store = true;
+    };
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 30d";
+    };
+  };
+
+  # System-wide locale
+  i18n.defaultLocale = "en_US.UTF-8";
+  time.timeZone = "UTC";
+
+  # Networking basics
+  networking.useDHCP = lib.mkDefault true;
+  networking.networkmanager.enable = lib.mkDefault false;
+
+}