(Corrects time since Guangzhou protest in 11th paragraph) By Bernard Orr BEIJING (Reuters) – Chinese cities imposed more curbs on Wednesday to rein in rising coronavirus cases, adding to investor worries about the economy as fresh unrest at the world’s largest iPhone plant highlighted the social and industrial toll of China’s strict COVID-19 measures. In Beijing, malls and parks were shut and once-bustling areas of the capital resembled ghost towns as authorities urged people to stay home. Shanghai barred recent arrivals from restaurants and other venues, and numerous cities have imposed local…