misc: Re-enable chat limit

chatbot.py

@@ -116,10 +116,9 @@ class Chatbot:
     def stream_chat(self, message, history):
         self.logger.info(history)
         self.logger.info(self.convert_to_chat_messages(history))
-        # Temporarily disable the question limit.
-        # if len(history) > 10:
-        #     yield "Thank you for using AweSumCare. I'm sorry I can't answer your question now, but I'm still learning. Please try to ask me something else.\n感謝使用安心三寶。現時未能回答你的問題，請稍後再試。"
-        #     return
+        if len(history) > 10:
+            yield "Thank you for using AweSumCare. I'm sorry I can't answer your question now, but I'm still learning. Please try to ask me something else.\n感謝使用安心三寶。現時未能回答你的問題，請稍後再試。"
+            return
         response = self.chat_engine.stream_chat(
             message, chat_history=self.convert_to_chat_messages(history)
         )