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/features/admin/nodes/EditNodeDialog.tsx

@@ -17,12 +17,22 @@ export function EditNodeDialog({ node, open, onOpenChange }: { node: NodeDto; op
   const [baseAddress, setBaseAddress] = useState(node.baseAddress)
   const [location, setLocation] = useState(node.location ?? '')
   const [isEnabled, setIsEnabled] = useState(node.isEnabled)
+  const [notifyOnStatusChange, setNotifyOnStatusChange] = useState(node.notifyOnStatusChange)
   const [username, setUsername] = useState(node.username)
   const [password, setPassword] = useState('')
 
   const mutation = useMutation({
     mutationFn: () =>
-      updateNode(node.id, name.trim(), baseAddress.trim(), location.trim() || undefined, isEnabled, username.trim() || undefined, password || undefined),
+      updateNode(
+        node.id,
+        name.trim(),
+        baseAddress.trim(),
+        location.trim() || undefined,
+        isEnabled,
+        notifyOnStatusChange,
+        username.trim() || undefined,
+        password || undefined,
+      ),
     onSuccess: async () => {
       toast.success(t('admin.nodes.updated'))
       await queryClient.invalidateQueries({ queryKey: ['admin-nodes'] })
@@ -66,6 +76,14 @@ export function EditNodeDialog({ node, open, onOpenChange }: { node: NodeDto; op
             <input type="checkbox" checked={isEnabled} onChange={(e) => setIsEnabled(e.target.checked)} />
             {t('admin.nodes.enabled')}
           </label>
+          <label className="flex items-center gap-2 text-sm">
+            <input
+              type="checkbox"
+              checked={notifyOnStatusChange}
+              onChange={(e) => setNotifyOnStatusChange(e.target.checked)}
+            />
+            {t('admin.nodes.notifyOnStatusChange')}
+          </label>
           <div className="flex flex-col gap-1.5">
             <Label htmlFor="editUsername">
               {t('admin.nodes.username')} ({t('admin.nodes.optional')})

frontend/src/features/admin/nodes/api.ts

@@ -15,12 +15,21 @@ export function updateNode(
   baseAddress: string,
   location: string | undefined,
   isEnabled: boolean,
+  notifyOnStatusChange: boolean,
   username: string | undefined,
   password: string | undefined,
 ) {
   return apiRequest<NodeDto>(`/admin/nodes/${id}`, {
     method: 'PUT',
-    body: { name, baseAddress, location: location ?? null, isEnabled, username: username ?? null, password: password ?? null },
+    body: {
+      name,
+      baseAddress,
+      location: location ?? null,
+      isEnabled,
+      notifyOnStatusChange,
+      username: username ?? null,
+      password: password ?? null,
+    },
   })
 }
 

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',