Stream model responses via SSE

curl --request POST \
  --url https://api-sandbox.featherhq.com/v1/model-router/stream \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "messages": [
    {
      "role": "<string>",
      "content": "<string>"
    }
  ],
  "router_config_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "config_overrides": {},
  "session_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "smart_routing": false
}
'

{
  "error": "<string>",
  "message": "<string>"
}