Chinese e-commerce giant JD.com is accelerating its push into robotics with a sweeping plan to automate its nationwide logistics network, while promising to retrain its vast workforce of couriers for technical roles as machines take over frontline duties.At an event in Beijing on Wednesday, the company’s logistics arm unveiled its industrial Wolf Robot series. Over the next five years, JD Logistics aimed to procure 3 million robots, 1 million unstaffed vehicles and 100,000 delivery drones to...