fix bug in adding camera

Summary: Configuration, без лицензии камера добавлена.
1. Открыть приложение;
2. Открыть вкладку Configuration;
3. Правый клик по кнопке add camera;
4. Выбрать камеру.
Result: При отсутствии лицензии камера добавлена.
Expecte result: При отсутствии лицензии камера не добавлена.

Look for the camera addition logic in the Configuration module, likely in a file handling camera management or license validation. The bug is that a camera can be added without a license; find where the license check should occur and ensure it blocks the addition. Test by attempting to add a camera without a license and verifying it fails.

Written by the indexing model from the issue text.