curl --request GET \
  --url https://api.yourdomain.com/api/chats/chat_123abc/messages \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "messages": [
    {
      "id": "msg_456def",
      "chatId": "chat_123abc",
      "role": "user",
      "parts": [
        {
          "type": "text",
          "text": "Hello, how can you help me today?"
        }
      ],
      "attachments": [],
      "createdAt": "2024-01-17T10:30:00Z"
    },
    {
      "id": "msg_789ghi",
      "chatId": "chat_123abc",
      "role": "assistant",
      "parts": [
        {
          "type": "text",
          "text": "I'd be happy to help! What would you like to know?"
        }
      ],
      "attachments": [],
      "createdAt": "2024-01-17T10:30:15Z"
    }
  ],
  "message": "Messages fetched successfully"
}