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/app.module.ts

@@ -3,6 +3,7 @@ import { ConfigModule } from "@nestjs/config";
 import { PrismaModule } from "./prisma/prisma.module";
 import { StorageModule } from "./storage/storage.module";
 import { CommonModule } from "./common/common.module";
+import { MailModule } from "./mail/mail.module";
 import { UsersModule } from "./users/users.module";
 import { AuthModule } from "./auth/auth.module";
 import { CustomersModule } from "./customers/customers.module";
@@ -14,6 +15,7 @@ import { PolicyOcrModule } from "./policy-ocr/policy-ocr.module";
 import { BankModule } from "./bank/bank.module";
 import { OpsModule } from "./ops/ops.module";
 import { ReportsModule } from "./reports/reports.module";
+import { NotificationsModule } from "./notifications/notifications.module";
 import { AppController } from "./app.controller";
 
 @Module({
@@ -22,6 +24,7 @@ import { AppController } from "./app.controller";
     PrismaModule,
     StorageModule,
     CommonModule,
+    MailModule,
     UsersModule,
     AuthModule,
     CustomersModule,
@@ -33,6 +36,7 @@ import { AppController } from "./app.controller";
     BankModule,
     OpsModule,
     ReportsModule,
+    NotificationsModule,
   ],
   controllers: [AppController],
 })