BEIJING (Reuters) – China ended its final week of 2021 with its biggest tally of local coronavirus cases for any seven-day period since subduing the country’s first epidemic nearly two years ago, despite an arsenal of some of the world’s toughest COVID-19 measures. The National Health Commission reported on Saturday 175 new community infections with confirmed clinical symptoms for Dec. 31, bringing the total number of local symptomatic cases in mainland China in the past week to 1,151. The surge has been driven mostly by an outbreak in the northwestern industrial and tech hub of Xian, a city o…