On the night of Nov. 16, a group of executives gathered in a private dining room of the restaurant La Chine at the Waldorf Astoria hotel in Midtown Manhattan. The table was laden with Chinese delicacies and $2,100 bottles of Château Lafite Rothschild. At one end sat Wu Xiaohui, the chairman of the Waldorf’s owner, Anbang Insurance Group, a Chinese financial behemoth with estimated assets of $285 billion and an ownership structure shrouded in mystery. Close by sat Jared Kushner, a major New York real estate investor whose father-in-law, Donald J. Trump, had just been elected president of the United