by Matthew Walsh, with Laurie Chen and Michael Zhang in Beijing SHANGHAI, BEIJING — Hundreds of people took to the streets in China’s major cities on Sunday to protest against the country’s zero-Covid policy in a rare outpouring of public anger against the state. China’s hardline virus strategy is stoking public frustration, with many growing weary of snap lockdowns, lengthy quarantines and mass testing campaigns. A deadly fire on Thursday in Urumqi, the capital of northwest China’s Xinjiang region, has become a fresh catalyst for public anger, with many blaming lengthy Covid lockdowns for hampering rescue efforts. Authorities deny the…