Upload a customer-service phone-call recording. The portal forwards it to the n8n
CSC Transcribe — Upload webhook, which transcribes via Azure Speech,
generates an LLM summary, and posts the result back to the matching Zammad ticket.
CSC_TRANSCRIBE_API_KEY is not set on this portal.
Uploads will be rejected with HTTP 500 until an operator adds it to
.env and restarts the apps service.