SAN DIEGO — Snowboarder Shaun White recently invested in Shelf Engine, a company that uses computer optimization to reduce food waste by more efficiently stocking grocery stores with perishable goods. One thing that’s not on the shelf yet: him. White confirmed this month what was widely expected, that the 35-year-old from Carlsbad will try to qualify for a fifth U.S. Olympic team and win a fourth gold medal in snowboarding’s halfpipe. Qualifying begins in December. The 2022 Winter Games open Feb. 4 in Beijing. “I’m feeling a little seasoned at this age but hanging in there,” White told a virtu…