Add status props in a shared folder

Statuts Enum:

draft — when created

sent — when you generate/send the PDF

accepted — when signed

rejected

expired — a cron job checks validUntil < today

The issue names a shared folder but no specific file, test, or entry point. Start by locating that folder and the existing document status model, then trace how PDF generation, signing, and validUntil are handled. Done means the listed statuses and expiration behavior are represented consistently.

Written by the indexing model from the issue text.