By Ryan Woo and Brenda Goh BEIJING/SHANGHAI (Reuters) -The Chinese capital Beijing tightened COVID restrictions on Sunday as it battled an outbreak, while Shanghai let more of its 25 million residents venture out for light and air after reporting a second day of zero infections outside of quarantine areas. The outbreak in Shanghai, which began in March, has been China’s worst since the early months of the pandemic in 2020. Hundreds of thousands have been infected and the city has forbidden residents from leaving their homes, to great public anger. Vice Premier Sun Chunlan, personally in Shangh…