- POST /api/mail/messages/{id}/read body {read: bool} - synchro IMAP + BDD
- POST /api/mail/messages/{id}/flag body {flagged: bool} - synchro IMAP + BDD
- IMAP-side non bloquant : BDD est mise a jour meme si IMAP fail (resync au prochain cycle)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>