fix: Add n8n environment variables to production deployment

- Add N8N_WEBHOOK_URL, N8N_SECRET_TOKEN, N8N_API_KEY to docker-compose.production.yml
- Export environment variables in workflow before docker-compose up
- Improve error logging in chat API for better debugging
- Add better error handling in ChatWidget component
- Create setup guide for n8n chat configuration

docker-compose.production.yml

@@ -19,6 +19,9 @@ services:
       - MY_INFO_PASSWORD=${MY_INFO_PASSWORD}
       - ADMIN_BASIC_AUTH=${ADMIN_BASIC_AUTH:-admin:your_secure_password_here}
       - LOG_LEVEL=info
+      - N8N_WEBHOOK_URL=${N8N_WEBHOOK_URL:-}
+      - N8N_SECRET_TOKEN=${N8N_SECRET_TOKEN:-}
+      - N8N_API_KEY=${N8N_API_KEY:-}
     volumes:
       - portfolio_data:/app/.next/cache
     networks: