Global French Doors Market Size, Share & Demand Report By Product Type (Single French Doors, Double French Doors, Sliding French Doors, Bi-Fold French Doors), By Material Type (uPVC French Doors, Wooden French Doors, Aluminum French Doors, Composite French Doors), By Application (Residential Buildings, Commercial Buildings, Institutional & Public Infrastructure), By Distribution Channel (Direct Sales, Specialty Retailers, Online Retail, Construction Material Distributors), By Region & Segment Forecasts, 2026–2031