Implement NotifyOnStatusChange feature for nodes and enhance Telegram notifications

- 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.

frontend/src/shared/api/types.ts

@@ -262,6 +262,7 @@ export type NodeDto = {
   location: string | null
   status: NodeStatus
   isEnabled: boolean
+  notifyOnStatusChange: boolean
   lastSyncAt: string | null
 }
 

frontend/src/shared/lib/i18n.ts

@@ -430,6 +430,7 @@ const resources = {
           },
           enabled: 'Включена',
           disabled: 'Отключена',
+          notifyOnStatusChange: 'Уведомлять в Telegram при смене статуса (онлайн/офлайн)',
           inbounds: 'Инбаунды',
           noInbounds: 'Инбаунды не найдены — нажмите «Синхронизировать».',
           publish: 'Публикация',
@@ -999,6 +1000,7 @@ const resources = {
           },
           enabled: 'Enabled',
           disabled: 'Disabled',
+          notifyOnStatusChange: 'Notify in Telegram on status change (online/offline)',
           inbounds: 'Inbounds',
           noInbounds: 'No inbounds found — click "Sync".',
           publish: 'Publishing',