0cce586a1f
LST-69 (3.2) phase 3. Wires the existing notification system to client-ticket events (the bell/useNotifications/endpoints already existed). - Notification.relatedTicket (ManyToOne ClientTicketInterface, SET NULL) + additive migration + notification:read group. - NotifierInterface::notify() gains a backward-compatible optional relatedTicket param (existing callers unchanged). - ClientTicketNumberProcessor (POST): notifies all ROLE_ADMIN users (ticket_created), tolerant try/catch after flush. ClientTicketStatusProcessor (PATCH): notifies submittedBy on status change (ticket_status_changed). - Front: notification DTO relatedTicket; NotificationBell navigates to /admin (admin) or /portal (client) on ticket notifications. 180 tests green (178 + 2), nuxt build passes, cs-fixer clean.