chore: initial monorepo scaffold + WDS Phase 1+2 artifacts

- Nx 22.7 monorepo (pnpm 11.1, TypeScript 5.9, Node 24)
- apps/api: NestJS 11 (CJS conforme CODING-RULES.md PGD-DB-004)
- apps/web: React 19 + Vite 8 (ESM)
- libs/shared/api-interface: Zod contract base
- Docker Compose dev: Postgres 18, Valkey 8, MinIO, Mailpit
- WDS artifacts:
  - design-artifacts/A-Product-Brief/ (5 docs canônicos + 16 dialogs)
  - design-artifacts/B-Trigger-Map/ (hub + 4 personas + feature impact)
- Stack canon: STACK.md v2.2 + CODING-RULES.md v2.0 + brand.md
- AGENTS.md + README.md como entrada para devs/agentes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,87 @@
+# SAR — Stack de desenvolvimento local
+# Alinhado com STACK.md JCS v2.2 (Postgres 18, Valkey, MinIO)
+# Uso: pnpm dev:up | pnpm dev:down | pnpm dev:logs
+
+services:
+  postgres:
+    image: postgres:18-alpine
+    container_name: sar-postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: sar
+      POSTGRES_PASSWORD: sar_dev_password
+      POSTGRES_DB: sar_master
+      # Inicializa também workspace de exemplo (default-workspace)
+      # multi-tenancy real virá com master-login na próxima sessão
+    ports:
+      - '5432:5432'
+    volumes:
+      - sar-postgres-data:/var/lib/postgresql/data
+      - ./scripts/postgres-init:/docker-entrypoint-initdb.d:ro
+    healthcheck:
+      test: ['CMD-SHELL', 'pg_isready -U sar -d sar_master']
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  valkey:
+    image: valkey/valkey:8-alpine
+    container_name: sar-valkey
+    restart: unless-stopped
+    command: valkey-server --save 60 1 --loglevel warning
+    ports:
+      - '6379:6379'
+    volumes:
+      - sar-valkey-data:/data
+    healthcheck:
+      test: ['CMD', 'valkey-cli', 'ping']
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  minio:
+    image: minio/minio:latest
+    container_name: sar-minio
+    restart: unless-stopped
+    command: server /data --console-address ':9001'
+    environment:
+      MINIO_ROOT_USER: sar_minio_admin
+      MINIO_ROOT_PASSWORD: sar_minio_dev_password
+    ports:
+      - '9000:9000' # API S3-compat
+      - '9001:9001' # Console web (http://localhost:9001)
+    volumes:
+      - sar-minio-data:/data
+    healthcheck:
+      test: ['CMD', 'curl', '-f', 'http://localhost:9000/minio/health/live']
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # Mailpit — captura emails locais (substitui Resend em dev)
+  mailpit:
+    image: axllent/mailpit:latest
+    container_name: sar-mailpit
+    restart: unless-stopped
+    ports:
+      - '1025:1025' # SMTP
+      - '8025:8025' # Web UI (http://localhost:8025)
+
+  # PostHog cloud-image-self-hosted? Por ora, deixar comentado.
+  # No MVP, PostHog é instalado em VM/LXC Proxmox dedicada (separado do dev).
+
+  # master-login stub? Por ora, deixar comentado.
+  # JWT secret de dev será injetado via .env; master-login real virá na próxima sessão.
+
+volumes:
+  sar-postgres-data:
+    name: sar-postgres-data
+  sar-valkey-data:
+    name: sar-valkey-data
+  sar-minio-data:
+    name: sar-minio-data
+
+networks:
+  default:
+    name: sar-dev-network
+    driver: bridge