Boilers and Steam Generators Market Size & Forecasts 2026-2035, By Segments (Boiler Type, Pressure Range, Application, Fuel Type, Capacity), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Viessmann, Bosch Thermotechnology, Miura, Cleaver-Brooks, Babcock & Wilcox)