Add n8n service to docker-compose

- docker-compose: n8n container (port 5678) with PostgreSQL backend
- n8n/: 7 TypeScript workflow files + import script + README
- Workflows: 4 CMS BI data ingestion + 3 email reports
- README: updated with n8n env vars and port
- .dockerignore: exclude import.sh from container

docker-compose.yml

@@ -41,5 +41,36 @@ services:
       retries: 5
     restart: unless-stopped
 
+  n8n:
+    image: n8nio/n8n:latest
+    container_name: jetour-n8n
+    ports:
+      - "5678:5678"
+    environment:
+      N8N_ENCRYPTION_KEY: "${N8N_ENCRYPTION_KEY:-change-me-to-a-random-string}"
+      DB_TYPE: postgresdb
+      DB_POSTGRESDB_HOST: db
+      DB_POSTGRESDB_PORT: "5432"
+      DB_POSTGRESDB_DATABASE: jetour-bi
+      DB_POSTGRESDB_USER: jetour
+      DB_POSTGRESDB_PASSWORD: ${DB_PASSWORD:-jetour}
+      N8N_HOST: localhost
+      N8N_PORT: "5678"
+      N8N_PROTOCOL: http
+      WEBHOOK_URL: http://localhost:5678/
+    volumes:
+      - n8n_data:/home/node/.n8n
+      - ./n8n:/workflows
+    depends_on:
+      db:
+        condition: service_healthy
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- http://localhost:5678/healthz || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
 volumes:
   pgdata:
+  n8n_data: