Adds a new Point of Sale self-ordering module that lets restaurant customers browse menus and place orders themselves, including through QR-code menu flows. This can reduce staff workload, speed up table service, and create a more modern ordering experience.

Sign requests can now include automatic email reminders for recipients who have not responded, helping businesses complete documents faster. Users can also set an expiry date after which a request is no longer available, improving control over time-sensitive agreements.

This PR add an email reminder to the sign requests that is setup at the creation of sign request sent by mail. These reminder mail are sent by a CRON to all recipient that have not responded yet and haven't chosen to ignore the reminder for this Sign Request.

Validity allow the user to set a validity after which the sign request will be unavailable.

task-id : 3230052