Monie Stewart-Cariaga recently decided to leave the townhouse she’s renting to buy a new home. For a single cocktail server, she couldn’t be in a better position to do it. Beyond the fair wage and tips she earns at the Paris Las Vegas Hotel and Casino, Stewart-Cariaga plans to take advantage of a home-buying assistance program run by the Culinary Workers Union Local 226, the powerful union that represents service workers like her on the Vegas strip.