Apple is taking Chinese smartphone maker Oppo to court, accusing it of luring away a key Apple Watch engineer and encouraging him to walk out the door with confidential health-sensing technology. The Cupertino-based lifestyle and tech giant claims it has clear evidence of misconduct and intent, with the lawsuit taking aim at both the well-known Chinese manufacturer and the former Apple employee. A laundry list of IP theft accusations And some suspicious Google searches In a complaint filed Thursday in federal court in San Jose, Apple claims Sensor System Architect Chen Shi secretly siphoned internal research before leaving Apple in…