Thermal Spa & Wellness Market Size & Forecasts 2026-2035, By Segments (Consumer Group, Customer Preference, Age Group, Type of Facility, Treatment Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Marriott, Hilton, Accor, IHG, Hyatt)