Etapa 7 — Motor de alertas (BullMQ)

Adiciona um processo worker separado do processo web (src/worker.ts,
WorkerModule) com dois crons diários e processors do BullMQ para alertas
de mensalidade (master→tenant) e cobrança (tenant→customer): marca
faturas/parcelas atrasadas, resolve template com fallback tenant→master
por canal, renderiza placeholders, dispara WhatsApp/e-mail com retry e
backoff exponencial, e grava alert_logs com idempotência por dia.

Módulo alerts (web) traz o CRUD de alert_templates (master e tenant) e a
consulta de alert_logs com filtros. alert_templates/alert_logs não têm
RLS no schema, então o isolamento entre tenants é feito manualmente
(PrismaMasterService + filtro por tenant_id), coberto por teste e2e
dedicado.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -11,6 +11,9 @@
     "start": "nest start",
     "start:debug": "nest start --debug --watch",
     "start:prod": "node dist/main",
+    "worker:dev": "nest start --watch --entryFile worker",
+    "worker": "nest start --entryFile worker",
+    "worker:prod": "node dist/worker",
     "lint": "eslint \"{src,test}/**/*.ts\" --fix",
     "test": "jest",
     "test:watch": "jest --watch",
@@ -22,16 +25,19 @@
     "prisma:studio": "prisma studio"
   },
   "dependencies": {
+    "@nestjs/bullmq": "^10.2.3",
     "@nestjs/common": "^10.4.15",
     "@nestjs/config": "^3.3.0",
     "@nestjs/core": "^10.4.15",
     "@nestjs/jwt": "^11.0.2",
     "@nestjs/passport": "^11.0.5",
     "@nestjs/platform-express": "^10.4.15",
+    "@nestjs/schedule": "^4.1.2",
     "@nestjs/throttler": "^6.5.0",
     "@prisma/client": "^5.22.0",
     "argon2": "^0.45.1",
     "axios": "^1.19.0",
+    "bullmq": "^5.34.5",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.1",
     "nodemailer": "^9.0.5",