BEIJING/SHANGHAI (Reuters) – Beijing shut scores of metro stations and bus routes and extended COVID-19 curbs on many public venues on Wednesday, focusing efforts to avoid the fate of Shanghai, where millions have been under strict lockdown for more than a month. The central city of Zhengzhou earlier also announced restrictions, joining dozens of big population centres under some form of lockdown as China seeks to eliminate a virus believed to have first emerged in Wuhan city in late 2019. But that uncompromising battle is undermining its growth and hurting international companies invested the…