BEIJING — Melania Trump stayed back at the White House and didn’t join her husband for the whirlwind Beijing summit — which was documented by her director. Melania Trump is in DC and marking the 180-day milestone since the president signed the Fostering the Future Executive Order, honoring one of her signature initiatives to help foster children. Instead, director Brett Ratner is in China with President Trump. Ratner, who directed “MELANIA,” the first lady’s self-titled documentary, traveled on