feat: Add new base service config for Darwin system

This commit introduces a new base configuration for the Darwin service. It includes options for system packages, shell programs and security features. This base configuration is customizable with an enable option.

modules/darwin/services/base/default.nix

@@ -0,0 +1,57 @@
+{ options
+, config
+, lib
+, pkgs
+, ...
+}:
+with lib;
+with lib.metacfg;
+let
+  cfg = config.metacfg.base;
+in
+{
+  options.metacfg.base = with types; {
+    enable = mkBoolOpt false "Whether or not to enable the base config.";
+
+  };
+
+  config = mkIf cfg.enable {
+    environment = {
+      systemPackages = with pkgs; [
+        age
+        delta
+        git
+        git-crypt
+        git-delete-merged-branches
+        home-manager
+        htop
+        mosh
+        nixpkgs-fmt
+        openssl
+        restic
+        rrsync
+        sops
+        tmux
+        vim
+        wget
+        starship
+      ];
+      shells = [ pkgs.fish pkgs.bash ];
+    };
+
+    programs = {
+      bash = {
+        ## shellInit = ''
+        interactiveShellInit = ''
+          bind '"\e[A": history-search-backward'
+          bind '"\e[B": history-search-forward'
+        '';
+      };
+      fish.enable = true;
+    };
+
+    security = {
+      pam.enableSudoTouchIdAuth = true;
+    };
+  };
+}