- Added `NotifyOnStatusChange` property to the `Node` class and related DTOs to allow individual node configuration for status change notifications. - Updated `NodeHealthCheckService` to send Telegram notifications to admins when a node's status changes, based on the new property. - Enhanced the `ITelegramNotifier` interface with a method for notifying admins about node status changes. - Modified the frontend to include a checkbox for `NotifyOnStatusChange` in the node editing dialog, allowing admins to easily configure this setting. - Updated API documentation to reflect the new `notifyOnStatusChange` parameter in the node update endpoint. - Added tests to ensure the correct behavior of the new feature and its integration with existing functionality.