Cancel a generation job

Cancel a running generation job. Can only cancel jobs in PENDING, ANALYZING, or GENERATING status. Args: job_id: The generation job UUID. session: Database session. repo: Generation job repository. Returns: CancelJobResponse with updated status. Raises: HTTPException: 404 if not found, 409 if not cancellable.

curl -X POST "https://loading/api/v1/servers/generate/497f6eca-6276-4993-bfeb-53cbbbba6f08/cancel"

{
  "job_id": "453bd7d7-5355-4d6d-a38e-d9e7eb218c3f",
  "status": "pending",
  "message": "string"
}

{
  "detail": [
    {
      "loc": [
        "string"
      ],
      "msg": "string",
      "type": "string",
      "input": null,
      "ctx": {}
    }
  ]
}