For the husband-and-wife team whose futuristic designs have shaped China’s most famous modern skylines, the last year has seen a precipitous fall.  In early July, Soho China’s chief financial officer was hit with an insider trading probe, adding to a cascade of recent issues for the property company, including government fines for electricity price gouging, debt load difficulties, and the failure of a $3 billion takeover offer from the U.S. private equity giant Blackstone. Since that