Automotive E-Tailing Market Size & Forecasts 2026-2035, By Segments (Sales Channel, End User, Vehicle Type, Product Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (CarGurus, Auto Trader, Carvana, Cars.com, CarDekho)