I need a scalable and professional travel booking website with future expansion capability. Core Features (Phase 1): 1. Train ticket booking integration (IRCTC authorised agent login integration). 2. Hotel booking system with API integration (live search, booking, cancellation). 3. Bus ticket booking integration with API (seat selection, boarding points, live availability). 4. User signup and secure login system. 5. Customer wallet system (add balance, wallet payment, refunds). 6. Online payment gateway integration (UPI, debit/credit card, net banking). 7. Admin panel to manage bookings, users, commissions, wallets, and reports. 8. Agent/Sub-agent panel with commission and wallet management. 9. Booking history and invoice download. 10. AI chat support for customer assistance. 11. Fully mobile responsive website. Future Expansion (Must be supported in architecture): - Flight booking integration - Mobile app (Android/iOS) - Multi-vendor/agent marketplace - Offers, coupons, and loyalty system - WhatsApp API integration - Advanced analytics dashboard Requirements: - Scalable architecture and clean coding. - Secure and fast performance. - Full source code ownership and admin access. - Developer must assist with API integrations and deployment. - Proper documentation for future upgrades. Please share timeline, technology stack, and total cost.