The cycleway can be used in both directions between the tunnel and the the crossing across the Silberburgstraße.
I don't know how to map this.

There is no separate Foot Path here. This is a regular Sidewalk for Foot and Bike Traffic. Can be merged into the street in my opinion.

The Telekom Shop is closed.

This part is completely fenced off on both sides. Could someone map this correctly?

There are separate bike paths mapped out on each side of this road. Shouldn't this road be tagged bicycle=no then?

There is no bike lane on this side of the road. All bike traffic should be routed on the bike path next to the southern lanes.

Shouldn't this roundabout be a one-way-street?