Paroxysmal Nocturnal Hemoglobinuria Drug Market Size & Forecasts 2026-2035, By Segments (Drug Class, Route of Administration, Treatment Type, End-user), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Alexion, Apellis, Novartis, Roche, Bioverativ)