PHOENIX—It’s been quite a week for Breanna Stewart, Sue Bird, and Jewell Loyd. Five days after helping the United States win its seventh consecutive Olympic gold medal, they added the inaugural WNBA Commissioner’s Cup title to their resumes. Stewart scored 15 of her 17 points in the first quarter and the Seattle Storm routed the Connecticut Sun 79–57 on Thursday night. Loyd added 16, and Bird had 10. “It felt good,” Bird said. “We will always be the first winner. The Commissioner’s Cup is a good sign of things to come with our league.” They didn’t look jet lagged at all, outscoring Connecticut 43–40 heading into the fourth quarter when none of them played. Seattle had a 28-point lead at that point. After the game ended, the team celebrated on the court as confetti rained down. “It’s different because we don’t know how to feel. It is something big what …