Improve Utoipa usage

[holtgrewe]

Is your feature request related to a problem? Please describe.
Utoipa advertises recursive automated schema detection and the #[schema(as=)] Feature. Both would be useful in #612 but somehow don't work.

Describe the solution you'd like
Look into this in more detail, possibly post bug at utoipa with MWE.

Describe alternatives you've considered
N/A

Additional context

• feat: /api/v1/strucvars/csq endpoint with OpenAPI (#607) #612