T-System's LLMHUB is added as model provider backend. (#139)

.changeset/silent-buses-dance.md

helpers/env-variables.ts

helpers/providers/index.ts

helpers/providers/llmhub.ts

helpers/python.ts

helpers/types.ts

questions.ts

templates/types/streaming/fastapi/app/llmhub.py

templates/types/streaming/fastapi/app/settings.py