Consolidate models, pydantic, protobuf types

[holtgrewe]

Is your feature request related to a problem? Please describe.
There are subtle difference between the Django mdoels, Pydantic v2 models, and protobufs from the worker.

Describe the solution you'd like
Consolidate the types, names, etc. This must be followed by re-generating the spectacular-generated OpenAPI definitions as well as the front-end generated code.

Protobufs must be updated in worker.

Describe alternatives you've considered
N/A

Additional context
N/A