SAN DIEGO — San Diego State capped its first spring campaign under head coach Sean Lewis by throwing for four touchdowns and rushing for another in the Aztec FAST Showcase presented by Aztec Link Saturday at Snapdragon Stadium. AJ Duffy completed 7 of 11 passes for 112 yards and two touchdowns, Javance Tupou’ata-Johnson was 6-for-11 for 69 yards and a touchdown, and Kyle Crum was an efficient 5 of 7 for 36 yards and a touchdown. Lucky Sutton added a 1-yard touchdown run for the Aztecs, who scored on nine of their 14 offensive possessions in the game. On SDSU’s…