Add support for self-serve task services and validation logic

- Introduce `services` property to `department_selfserve_tasks_o` for task-specific functionalities.
- Add service validation and normalization via `selfserve_lane_services` enum.
- Extend `departmentSelfserveTasksRoute` to handle `services` input for add/edit operations.
- Create `selfserve_lane_services` enum to define and validate service types.

services/nginx/app/modules/selfserve/helpers/selfserve_lane_services.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace modules\selfserve\helpers;
+
+enum selfserve_lane_services
+{
+    case MACHINE; // Relay that controls the machine power
+
+}