NEW YORK — For years, as Donald Trump was soaring from reality TV star to the White House, his real estate empire was bankrolling big perks for some of his top executives, including apartments and luxury cars.Now Trump’s company, the Trump Organization, is on trial for criminal tax fraud — on the hook for what prosecutors say was a 15-year scheme by his most trusted lieutenant to avoid paying taxes on those fringe benefits.In opening statements Monday, prosecutors and defense lawyers sparred over the …