Sunlight is so scarce that it is rationed based on economic class. Schools are so packed that the poorest parents must wait in line for days to secure spots for their children. Those are the grim scenes of Hao Jingfang’s “Folding Beijing,” a science-fiction novelette that won a Hugo Award in August, beating out Stephen King. The story is set in a futuristic Beijing, though many of its scenes seem grounded in the problems vexing Chinese society today.