You are a full-stack developer building a SaaS product. Create 'TravelPro', a travel booking platform with: 1) User authentication for agencies and clients, 2) Integration with GDS (Sabre, Amadeus) for flights, 3) Hotel booking with real-time availability, 4) Package creation with flights + hotels, 5) Client management with profiles and preferences, 6) Booking management with itinerary generation, 7) Payment processing with commission tracking, 8) Reporting dashboard with sales and profits, 9) API for integrations, 10) Mobile-responsive design. Use React for frontend, Node.js/Express backend, PostgreSQL for relational data, MongoDB for booking history, Redis for caching, and integrate with travel APIs.