toner-management: Unauthenticated State-Changing Admin Actions

toner-management's admin state-changing handlers (add.php, edit.php, delete.php under admin/toners, admin/toner-brands, admin/printers, and related admin subdirectories) executed INSERT/UPDATE/DELETE database operations with no authentication or authorization check, while access control was enforced only in listing views. An unauthenticated remote attacker could invoke these handlers directly to create, modify, or destroy application data. The vendor has since merged a fix requiring an authenticated admin session before any such handler proceeds.