Replaces the four legacy PHP scripts under email.notifications/send*.php
with a single NestJS module. Four jobs (outstanding payments, payment
confirmations, account-status alerts with day-of-week gates, trust
payment confirmations) share one MailService modelled on StorageService:
env-driven SES client, null fallback in dev with console logging, refuses
to send in production when unconfigured.
Schema adds email_notification_log (every attempt, sent/failed/skipped)
and account_status_history (one row per threshold hit, Job 3). Enums
encode the legacy wire shape so external log scrapers keep parsing
notificationType keys verbatim.
Web adds /notificaciones with four trigger cards, a flags panel, and a
paginated log browser. New notification:send ability gates all four
endpoints at MANAGER, matching the renewal:send trust tier.
rmancinas
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