Base User Signature

This module adds a new image field called digital_signature on res.users. Users can draw their signature directly in Odoo using a signature pad widget, and the image is stored on their user record.

Where it appears: - On the user form (the standard user screen), a "Signature" label and signature pad are added right after the existing signature field. - On the user's personal preferences screen, the same signature pad is added, and it is editable there so users can sign themselves.

Business rules and behaviours shown in the code: - The signature image is automatically resized to a maximum of 1024 by 1024 pixels. - The image is not copied when a user record is duplicated (copy=False). - A trash button next to the signature lets users clear it; it calls clear_digital_signature, which sets the field to empty. - The field is added to the lists of fields users can read and write about themselves, so it works from the personal preferences screen.

Areas touched: the user model res.users and its two main forms (administrator user form and personal preferences). No menus, reports, emails or scheduled jobs are added.