refactor(flake-parts): initial flake-parts configuration

inputs/system/modules/base/services/dbus/default.nix

@@ -0,0 +1,17 @@
+{ lib, config, pkgs, ... }:
+
+let
+  inherit (lib) mkIf;
+  inherit (lib.lists) any elem;
+  hasFunction = f: elem f config.systemModules.host.function;
+in
+
+{
+  config = mkIf (any hasFunction ["workstation" "gaming"]) {
+    services.dbus = {
+      enable = true;
+      packages = with pkgs; [ dconf gcr udisks2 ];
+      implementation = "broker";
+    };
+  };
+}