Thibaut,
The cknfg you have shared is for a non-dashboard version, the Gateway either uses files (and no dashboard at all) or has the dashboard (and does not use files at all).
APIs that yu have loaded using files will not find their way into the dashboard, because the dashboard stores data in MongoDB and feeds data to gateways via a service.
If you want to use the dashboard, you’ll need to use the dashboard enabled config template (these can be found in the install/data directory, or here:
https://github.com/TykTechnologies/tyk/blob/master/install/data/tyk.with_dash.conf
M.