Chinese automaker BYD (1211.HK) has inked a deal with DeepSeek to co-develop new autonomous technology, which could be bad news for automakers like Tesla (TSLA). DeepSeek, the China-based generative AI company, has been in the spotlight recently, largely because it offers AI technology comparable with OpenAI's but reportedly at less expense while requiring fewer resources. BYD, China's largest automaker, has taken a more cautious approach to its autonomous technology compared to Tesla. But the company is now rolling out its “God’s Eye” advanced driver assistance system (ADAS) to all of its cars, from its expensive YangWang models to entry-level autos…