Description

Currently, the OpenAiClient::chat_completions method returns a stream of sse::Event messages when stream: true, as opposed to deserializing the events to ChatCompletionChunks as we are passing them through to the client directly. As we will need to apply detections on the chunks, this needs to be changed to the latter.

Acceptance Criteria

• ChatCompletionsResponse::Streaming variant receiver type is updated to mpsc::Receiver<Result<ChatCompletionChunk, Error>>
• OpenAiClient::chat_completions deserializes SSE event data to ChatCompletionChunk and maps errors to client::Error
• Orchestrator::handle_chat_completions_detection is updated accordingly