COLUMBIA, S.C.—No. 1 South Carolina added another milestone to what’s shaping up as a truly special season—the biggest comeback in program history. The Gamecocks rallied from 18 points down to beat defending national champion Stanford 65-61 and keep their perfect, 12-0 start alive. Aliyah Boston had 18 points, including the go-ahead basket with 1:05 left…