Refresh node load in location picker without page reload

Invalidate available-inbounds when the create dialog opens, after a
config is created or revoked, and on realtime config status changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/shared/realtime/RealtimeProvider.tsx

@@ -44,6 +44,8 @@ export function RealtimeProvider({ children }: { children: React.ReactNode }) {
           ? { ...prev, configs: prev.configs.map((c) => (c.id === payload.configId ? { ...c, status: payload.status } : c)) }
           : prev,
       )
+      // Загрузка нод считается по Active-конфигам — смена статуса её меняет.
+      void queryClient.invalidateQueries({ queryKey: ['available-inbounds'] })
     }
 
     const onUserActivated = (_payload: UserActivated) => {