This update adds automated checks to help ensure that devices stay properly synchronized in Point of Sale and Restaurant workflows. It reduces the risk of order or session information getting out of sync across tills, tablets, or restaurant devices, while noting that more synchronization coverage may be added later.

This commit add somes tests to ensure that the devices synchronisation works correctly in the Point of Sale and the Restaurant modules.

This commit does not cover the entire synchronization code, so testing will need to be improved over time.

Forward-Port-Of: odoo/odoo#219957

The certified scale integration now aligns its checksum expectations with updated Toledo scale error checks. This helps keep point-of-sale scale certification behavior consistent after related reliability improvements.

This PR adapts the scale checksum to the PR adding the error checks to Toledo scales:
https://github.com/odoo/odoo/pull/217674

Forward-Port-Of: odoo/enterprise#90954
Forward-Port-Of: odoo/enterprise#89602