When Kathy Tang (not her real name) and her fellow Hong Kong interns arrived at the Palace Museum in Beijing’s Forbidden City in 2017, they received a royal welcome.High hopes were placed on this first batch of 15 young Hongkongers hand-picked by the Hong Kong government as part of the celebration for the 20th anniversary of Hong Kong’s handover to China in 2017 – the year that Carrie Lam Cheng Yuet-ngor took office as the city’s chief executive.These university students were to set a shining…