The Belgian account tags for form 281.50 now carry the country set to Belgium. This makes them easier to organize and allows the same tags to be reused more cleanly in other contexts.

Account tags for 281.50 are specific to Belgium.
With this PR, the country is added to those tags, allowing easier group by and enabling their use in other cases as well.

task-5236632

Forward-Port-Of: odoo/enterprise#98759

The point-of-sale blackbox queue is now cleared when data is reloaded. This helps avoid rare situations where queued calls could get stuck in a loop, improving reliability during POS updates.

This commit adds a clear of the blackbox queue when reloading data. This could avoid potential unexpected deadloop of calls in the queue.

This change makes several point-of-sale blackbox JavaScript helpers available for import by other files later on. It does not change how the feature works today, but it improves maintainability and makes future updates easier to build.

This commit puts export in front of some of the blackbox js utils/services/constants to make them importable from other files in the future.