{"success":true,"message":"Royal Nano Backend API","version":"1.0.0","endpoints":{"contact":"POST /api/contact","join":"POST /api/join","upload":"POST /api/upload","carBrands":"GET /api/car-brands","carModels":"GET /api/car-models?brand=BMW","serviceTypes":"GET /api/service-types","userPermissions":"GET /api/user/permissions (requires Firebase token)","health":"GET /api/health"}}