RUSSELSHEIM: As Germany's Opel slashes its engineering ranks and partners with China's Leapmotor, anxiety is running high in Ruesselsheim, the city it has long dominated.Struggling like many other European automakers, Opel is expanding its partnership with Leapmotor to build a new SUV, tapping the Hangzhou-based company's expertise on electric vehicles and low-cost production — while leaving Opel's local engineers to perform more old-fashioned vehicle design work.Stellantis, Opel's multinational parent company, said in April that it would cut 650 engineering jobs — from a total workforce of 1,650 — at its Ruesselsheim development centre, amid a wave of job cuts across…