By Brenda Goh and Winni Zhou SHANGHAI (Reuters) -Shanghai is set to put the vast majority of its residents under COVID lockdown from Friday, as it expands curbs to include the western half of the city and extends restrictions in the east where people have already been forced to stay home since Monday. The Chinese commercial hub, home to 26 million people, is on the fourth day of a 10-day lockdown that was to cover the city in two phases, with first the east and then the west entering lockdowns of five days each. The stay-at-home measure in the financial and industrial districts in the east beg…