Seawall Capital LLC is betting on soccer’s growing popularity with a majority stake in Sports Endeavors Inc., the owner of online retailer soccer.com and the Eurosport soccer catalog.Austin-based Seawall and the Moylan family, which founded Sports Endeavors in 1984 and will continue to run the company as a minority owner, see an opportunity from growing interest in soccer across the U.S. as the FIFA World Cup kicks off this fall and the women’s World Cup follows next year.