Get a thread

{
  "assistant_id": "a1b2c3d4-5678-9abc-def0-1234567890ab",
  "created_at": "2025-03-15T09:12:33.456789Z",
  "id": "1a2b3c4d-5678-9abc-def0-112233445566",
  "last_updated_at": "2025-03-15T09:45:12.123456Z",
  "tenant_id": "abcd1234-ef56-7890-abcd-ef1234567890",
  "title": "Kündigung während der Probezeit",
  "user_id": "f8e7d6c5-4321-fedc-ba98-765432109876"
}

{
  "error_code": "thread_is_deactivated",
  "detail": "Thread is deactivated"
}

{
  "error_code": "unauthorized",
  "detail": "Missing or invalid API key"
}

{
  "error_code": "thread_not_found",
  "detail": "Thread not found"
}

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

{
  "error_code": "internal_server_error",
  "detail": "Internal Server Error"
}