Health Tracker Simple tracking for water intake and sleep using JSON file. Data Format File: Add Water Record When user says "uống X cốc" or "uống nước X cốc": Replace with number from user input. Add Sleep Record When user says "đi ngủ": Add Wake Record When user says "thức dậy" or "dậy rồi": View Stats When user says "thống kê" or "xem thống kê": Update Record To update last water entry: Delete Record To delete last water entry: Notes - Uses Node.js built-in modules only - File auto-created if missing - All timestamps in ISO8601 format ---