feat: port Phase 1 foundational modules and setup comin in flake.nix

users/admin/default.nix

@@ -0,0 +1,39 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.homelab.users.admin;
+in {
+  options.homelab.users.admin = {
+    enable = lib.mkEnableOption "user System Administrator";
+    authorizedKeys = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [
+        # HomeLab > NixOS > admin > ssh
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGWIOOEqTy8cWKpENVbzD4p7bsQgQb/Dgpzk8i0dZ00T"
+      ];
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    nix.settings.trusted-users = [
+      config.users.users.gh0st.name
+    ];
+
+    users.users.gh0st = {
+      description = "System Administrator";
+      isNormalUser = true;
+      extraGroups = [
+        config.users.groups.wheel.name # Enable 'sudo' for the user.
+      ];
+      initialPassword = "ChangeMe";
+      openssh.authorizedKeys.keys = cfg.authorizedKeys;
+      packages = with pkgs; [
+        curl
+        git
+        tmux
+        vim
+        wget
+      ];
+    };
+  };
+}