German automakers have turned up in full force at Shanghai's Auto Show as they fight to stay on top of consumer trends in the country that will define whether they maintain their market dominance in the electric age both at home and abroad. Their heavy presence – with the entire board of Volkswagen AG and more than 100 VW employees attending, in contrast to Japanese or French automakers – shows they are taking the challenge seriously, said Yale Zhang of Shanghai-based consultancy Automotive Foresight. But with German companies relying on China for a third of their passenger vehicle sales, they…