Thirteen new food “concepts” will debut Sunday at Levi’s Stadium when the San Francisco 49ers play the home opener of their sixth season in Santa Clara. Many of the concepts will be branches of Bay Area-based restaurants or bars, such as Super Duper Burgers, Indian food catering company Curry Roots, or San Francisco-distilled Gold Bar whiskey. But as is the case at most large entertainment venues, sports stadiums and airports, they are being brought in by a larger concessionaire: Levy Premium…