docs(sessions): add POST /api/sessions/{sessionId}/chats/{chatId}/messages endpoint for persisting assistant messages

PR
5mo ago
+200-2
  • Introduced a new POST endpoint to allow the upsertion of assistant chat messages into specified chats within a session.
  • Detailed request and response schemas added, including validation rules for message structure and error handling.
  • Updated navigation to include the new endpoint in the sessions documentation, enhancing the API's capabilities for chat management.