Intégration MainWP Uptime Monitor Avancée 5.4

* Added: Abilities API support for uptime monitor providers.
* Updated: Migrated UptimeRobot integration to the latest Uptime Robot REST API.
* Updated: Improved monitor creation, editing, deletion, duplicate handling, and rollback behavior.
* Updated: Improved handling of missing data, API errors, rate limits, and unavailable ratios.

* Updated: Optimized plugin initialization timing to improve compatibility and reliability within the WordPress environment.
* Updated: Improved site-based access control for monitors so users can only view monitoring data for sites they are permitted to access.
* Updated: Refined UI elements for better consistency with the rest of the system.

* Fixed: PHP Notice about `mysqli_ping()` function deprecation in PHP 8.4
* Fixed: Enhanced notification configuration handling for NodePing monitors to support flexible notification entry formats.
* Updated: Minor UI changes