Lam, a data expert working for a top Hong Kong-based company, was born and bred in Kowloon Bay. But the city she once knew has vanished among mainland Chinese tourists’ shopping bags, crowded pavements and – most worryingly, she says – diminishing freedoms.The 28-year-old first thought of obtaining Portuguese nationality about five years ago. But she got busy and the plan was placed on hold until the recent political turmoil over Hong Kong’s extradition bill.“It made me revisit this idea. I don…