For guests at the “Dolce Hanoi Golden Lake” coffee comes in a gold cup and bath time is taken in gilded splendour.The world’s first self-proclaimed gold-plated hotel is open for business — and the Vietnamese owners insist they have the Midas touch despite the cramping of global travel during the coronavirus pandemic.The hotel cost $200 million to construct with a 24-carat plating across lobbies, an infinity pool and rooms with even cutlery, cups, shower heads and toilet seats receiving the golden treatment.While expensive for Vietnam, at $250 a night it is not prohibitive for wealthy locals c…