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Add REST API endpoints for court management and availability: - GET/POST /api/courts for listing and creating courts - GET/PUT/DELETE /api/courts/[id] for single court operations - GET /api/courts/[id]/availability for time slot availability - GET /api/sites for listing organization sites Features include organization-based filtering, role-based access control, premium pricing for evening/weekend slots, and booking conflict detection. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>