NANJING, China— Skyworth Auto’s ambitions are visible everywhere in its electric-vehicle showroom here. A video spins the story of a founder who, like a Chinese version of Elon Musk , slept in the factory to get the company up and running. A map touts its presence in 45 countries. A new sport-utility vehicle is on display. Back in 2021, Skyworth said its main EV plant could make 100,000 vehicles a year. Its actual sales in China this year through September: 660. A brutal season has arrived in China’s car market, among the most troubled in the world. Through September, Chinese…