Japan’s chip-related shares including Advantest Corp. tumbled as Chinese AI startup DeepSeekBloomberg Terminal gained traction, raising concern the app will threaten US’s technological leadership.Nvidia Corp. tester supplier Advantest fell 8.2%, while Disco Corp. slid 2.9%. Tech and chip-related shares were vulnerable to profit taking Monday after surging last week on SoftBank Group Corp.’s plan to team up with companies including OpenAI and Oracle Corp. to invest in AI infrastructure in the US....