To be honest, you don’t need any routes to run in Zurich, because you will find everywhere some nice corners and sections.
Additionally, there are further running offerings available. The green marathon is a well signposted route around Zurich. Some of my routes run partly on the same trail.
All over Switzerland you will find so called “Vita Parcours“. This are some kind of forest fitness circles, interrupted by strength and skill exercises.
On this page (german only) you will find further signposted forest trail routes and also several woodchip trails. Some of them have public wardrobes nearby.
And for all of you looking for training tracks, this page lists all tracks in Zurich. They are open for public.