SAN DIEGO — In 16 NFL seasons, former Chargers tight end Antonio Gates used his talented feet to assemble a Hall of Fame-worthy career with 11,841 yards and 116 touchdowns. There’s still magic left in those route runners, apparently. Gates, 41, used those same feet to transform himself to 1963 and a Virginia mountain lodge, channeling Patrick Swayze’s character Johnny Castle in the iconic movie, “Dirty Dancing.” Instead of worrying about flag routes, Gates focused on a fresh and completely foreign type of footwork in the current Fox reality show, “The Real Dirty Dancing.” Ready … set … stress….