Baidu Inc. is set to unveil a pair of glasses with a built-in AI assistant, putting up a Chinese rival to the Meta Ray-Bans that have proven a rare success in AI-powered hardware.China’s search leader and longtime investor in artificial intelligence plans to showcase the product at its annual Baidu World event in Shanghai next week, according to a person familiar with its schedule. The gadget will have built-in cameras to capture photos and video and will support voice interactions built atop Ba...