feat: add N8N workflows and auto-setup configuration

- Add parapharmacy-scraper workflow (scheduled every 3 days)
- Add parapharmacy-manual-scraper workflow (webhook triggered)
- Configure N8N to auto-create owner account (skips /setup)
- Add N8N environment variables to docker-compose.yml
- Add README with setup and usage instructions

docker-compose.yml

@@ -118,19 +118,29 @@ services:
     ports:
       - "5678:5678"
     environment:
+      # Owner account (skips /setup)
+      N8N_USER_MANAGEMENT_DISABLED: "false"
+      N8N_OWNER_EMAIL: ${N8N_EMAIL:-admin@farmafinder.com}
+      N8N_OWNER_PASSWORD: ${N8N_PASSWORD:-change-me}
+      # Auth
       N8N_BASIC_AUTH_ACTIVE: "true"
       N8N_BASIC_AUTH_USER: ${N8N_USER:-admin}
       N8N_BASIC_AUTH_PASSWORD: ${N8N_PASSWORD:-change-me}
+      # Database
       DB_TYPE: postgresdb
       DB_POSTGRESDB_HOST: postgres
       DB_POSTGRESDB_DATABASE: farmafinder
       DB_POSTGRESDB_USER: farmafinder
       DB_POSTGRESDB_PASSWORD: ${PG_PASSWORD:-change-me-in-production}
+      # Network
       N8N_HOST: localhost
       N8N_PORT: 5678
       N8N_PROTOCOL: http
+      # Webhook URL for external calls
+      WEBHOOK_URL: http://localhost:5678/
     volumes:
       - n8n_data:/home/node/.n8n
+      - ./n8n/workflows:/home/node/workflows
     depends_on:
       - postgres