Introduce self-serve module with lane management functionality

- Added `selfserve_lane` class to handle self-serve lane operations.
- Implemented commands (START, STOP, RESET) and states (IDLE, IN_WASH, FAULT, etc.) for lane lifecycle.
- Introduced traits for managing lane status, mode, state, caching, and port control.
- Added enums for cohesive type definitions (`selfserve_lane_command`, `selfserve_lane_status`, `selfserve_lane_state`, etc.).
- Configured `/modules/self-serve/lane/status` route to expose lane state and status via API.
- Linked self-serve configuration via `selfserve_c` and `selfserve_enabled_c` for module toggling.
- Integrated lane caching logic with Redis for performance improvements.
- Updated `index.php` to include the self-serve module.

services/nginx/app/classes/selfserve.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace classes;
+
+require_once WD . '/modules/selfserve/selfserve_c.php';
+require_once WD . '/modules/selfserve/classes/selfserve_lane.php';
+
+
+/**
+ * Actions
+ */
+
+
+use Exception;
+use interfaces\universal_module_i;
+use modules\selfserve\classes\selfserve_lane;
+use modules\selfserve\selfserve_c;
+
+class selfserve implements universal_module_i
+{
+    /**
+     * The configuration of the module
+     * @var selfserve_c
+     */
+    public selfserve_c $config;
+
+    public function __construct()
+    {
+        $this->config = new selfserve_c();
+    }
+
+    public function lane(int $lane_id): selfserve_lane
+    {
+        return new selfserve_lane($lane_id);
+    }
+
+    /**
+     * @inheritDoc
+     * @throws Exception If the module is not enabled
+     */
+    public function requireModuleEnabled(): void
+    {
+        if (!(bool)$this->config->enabled->getVariableValue()) {
+            throw new Exception('selfserve module is not enabled');
+        }
+    }
+}