One year after China’s aggressive property stimulus, prices are still falling in most cities - except Shanghai. Analysts explain why.   SHANGHAI: Buying a new apartment in Shanghai these days requires more than just cash - it takes stamina, luck - and sometimes a bit of theatre. At a recent weekend launch of One Tian An Place, a mid-range project in the well-established Jinyuan area of Minhang, hopeful buyers queued, clutching numbered slips that determined the order they could enter to claim a