By Tom Dierberger In most NFL locker rooms, the star quarterback gifts his teammates expensive gifts around the holidays, thanking them for their contributions this season. That’s not the case in the Bay Area, however. San Francisco 49ers star running back Christian McCaffrey was the one who splurged on teammates, giving them a new PXG golf bag, a coupon for a custom golf club fitting and a bottle of tequila. Brock Purdy, the man once known as Mr. Irrelevant who is now the 49ers’ long-term answer under center, was relieved to find out he was on McCaffrey’s nice list. “Financially I wouldn’t be…