MIAMI — Mike Brown has often repeated that the Knicks defense is ahead of the offense. And Sunday’s 115-107 defeat was reinforcement of the statement. The defense wasn’t good. But the offense was anemic. It barely existed outside of Jalen Brunson. The game was lost at the end of the third quarter and beginning of the fourth, when Brunson went to the bench and the Heat launched an 11-0 run. The Knicks went 4 ¹/₂ minutes without scoring. By the time Brunson returned with nine minutes left, the