This endpoint establishes a Server-Sent Events (SSE) stream to deliver real-time response parts to the client.
The stream emits the following events in sequence:

• chat: Sent at the beginning of the stream to provide chat context.
  
  event: chat
  
  data: {"chat_id": ..., "chat_title": ...}
• pending_tool_call: Sent at the moment when specific crypto tool was called.
  
  event: pending_tool_call
  
  data: {'call_id': call_..., 'title': {'en': 'Analyzing smart money trades..'}}
• finished_tool_call: Sent at the moment when specific crypto tool was finished.
  
  event: finished_tool_call
  
  data: {'call_id': call_...}
• message_start: Signals the beginning of a new message.
  
  event: message_start
  
  event: message_start
  
  data: {"t": ...} (multiple times)
• message_end: Indicates that the current message has finished. Includes the message ID.
  
  event: message_end
  
  data: {"message_id": ...}
• finish: Marks the end of the entire stream session.
  
  event: finish
  
  data: null