Adds support for the new Belgian Blackbox v2 requirements in Odoo Point of Sale. This helps Belgian businesses stay compliant with fiscal regulations while continuing to use POS workflows such as employee access and loyalty features.

This adds support for the Belgian Blackbox v2 requirements in Odoo Point of Sale, helping Belgian businesses meet fiscal compliance obligations. It introduces the related configuration, employee/user links, POS order and session handling, and receipt/signing flows needed to operate with the updated blackbox standard.