feat(notificaciones): mass email notifications over SES

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.

apps/api/src/notifications/notifications.module.ts

@@ -0,0 +1,18 @@
+import { Module } from "@nestjs/common";
+import { NotificationsController } from "./notifications.controller";
+import { NotificationsService } from "./notifications.service";
+
+/**
+ * Mass email notifications. MailModule is global (registered in AppModule),
+ * so this module needs no MailService import — it picks it up by injection.
+ *
+ * Cron sweeps (a future `@nestjs/schedule` trigger of these four methods on
+ * the legacy Mon/Wed/Fri cadence) belong in this module; the per-job
+ * service methods are already the entry points they would call.
+ */
+@Module({
+  controllers: [NotificationsController],
+  providers: [NotificationsService],
+  exports: [NotificationsService],
+})
+export class NotificationsModule {}