feat(monitoring): add Laravel Nightwatch monitoring support

- Install laravel/nightwatch package for application monitoring
- Create Nightwatch console command to start the monitoring agent
- Add NIGHTWATCH_ENABLED and NIGHTWATCH_TOKEN environment variables
- Configure nightwatch settings in config/constants.php
- Set up Docker s6-overlay services for both development and production
- Disable Nightwatch by default in test environment

config/constants.php

@@ -55,6 +55,10 @@ return [
         'is_scheduler_enabled' => env('SCHEDULER_ENABLED', true),
     ],
 
+    'nightwatch' => [
+        'is_nightwatch_enabled' => env('NIGHTWATCH_ENABLED', false),
+    ],
+
     'docker' => [
         'minimum_required_version' => '24.0',
     ],