Creates a new message in the specified chat and streams the LLM response to the client as NDJSON. Since chat history is persisted, it manages response ID internally. It requires the 'VirtualEnergyManager' feature flag to be enabled for the user.

The response body is streamed as newline-delimited JSON (application/x-ndjson). Each line is a JSON object representing one EnergyCap.DTO.V202510.WattsChatEventDTO — the concrete event type is distinguished by its type discriminator field. The stream terminates with either a done event (success) or an error event (failure).

{  "content": "string"
}