feat(PROJ-33): IMAP UID-Stabilität + Shared/Personal-Modus
Backend:
- storage: uid BIGSERIAL Migration, MailWithUID, GetMailsWithUID, GetMailsByRecipient
- tenantstore: imap_mode Spalte, GetIMAPMode, SetIMAPMode
- imapserver: stable UIDs aus DB, personal/shared Modus, userEmail in session
- api: GET/PUT /api/admin/settings/imap-mode (domain_admin only, double opt-in)
Frontend:
- IMAPSettingsTab: Modus-Anzeige + Toggle mit Double-Opt-In Dialog
- Admin-Panel: IMAP-Tab für domain_admin
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sysops
8d0f685fc9