BEIJING — China announced its lowest growth target in 35 years Thursday as the world’s second-biggest economy struggles with challenges at home and growing uncertainty around the world. This year, China will aim for gross domestic product growth of 4.5% to 5% “while striving for better in practice,” Premier Li Qiang, China’s No. 2 official, said in a “work report” delivered in the Great Hall of the People in Beijing during the opening session of the National People’s Congress, China’s biggest political event of the year. That figure, the country’s lowest since 1991, compares with the 5% target achieved last year, and it is the first formal downgrade since 2023. It’s an acknowledgment that China’s growth is slowing as the model that supercharged its economy for decades starts to reach its limits. “While recognizing our achievements, we are also clear-eyed about the difficulties and challenges we face,” Li said in his more than hourlong address, during which he read much of the 35-page report.…