Prosecutors are seeking a warrant to arrest Samsung Group’s Jay Y. Lee for allegations including bribery and embezzlement, a stunning turn for the scion of South Korea’s richest family groomed for decades to take over the company from his father. Lee, 48, the de facto head of the Samsung Group and vice chairman of Samsung Electronics Co., is accused of participating in payments that Samsung made to a close friend of South Korean President Park Geun-hye in exchange for government support in the company’s succession planning.