TheTreasury Department said Friday it was allowing American tech firms to expand their business in Iran, one of the most sanctioned countries in the world, to boost internet access for the Iranian people. The Iranian government cut most internet access for its 80 million citizens during a crackdown on demonstrators protesting the death of 22-year-old Mahsa Amini in the custody of Iran’s morality police. The morality police detained Amini last week, saying she didn’t properly cover her hair with the Islamic headscarf, known as the hijab, which is mandatory for Iranian women. Amini collapsed at …