Nothing mattered as much for the Knicks this morning than OG Anunoby’s leg injury. Not their gritty win over the 76ers to take a 2-0 lead in the Eastern Conference semifinals. Not Jalen Brunson’s fourth-quarter heroics. Not even Mitchell Robinson’s surprise last-minute scratch before Game 2  All that matters for the long-term prospects of this Knicks team is the health of Anunoby.  Here’s everything we know.  Analyzing OG Anunoby's latest leg injury  Anunoby appeared to suffer the injury with just over three minutes left in the game. He cut toward the basket, grabbed his right leg, then tried to dunk, but couldn’t get the push-off necessary to finish. He was subbed out of the game moments later and wasn’t on the Knicks bench for the remainder of the game.  Mike Brown says he has no update on OG Anunoby, who left the game with 2:31 remaining in 4th quarter due apparent to leg injury. Anunoby has been the most valuable Knick of this postseason to date.…