Time zone settings are being moved from individual work schedules to the company level. This simplifies configuration and helps keep attendance, leave, payroll, planning, project, and maintenance calculations consistent across business processes.

This commit removes the timezone field on resource_calendar and adds a new timezone field on the company.

task-5124688

The pricing label management features have been moved into their own Pricer app so they can be reused beyond Point of Sale, such as in Inventory. This also makes Pricer store and tag management accessible from the Inventory app, supporting broader operational use.

We extract `pricer` logic from `pos_pricer` to later use pricer in other modules (e.g. `stock`).

task-6377740