fix:修复不启动意图识别，functioncall依旧加载的bug (#691)

update：intent_llm意图识别获取新闻和天气过长，tts容易出错，暂时只支持简单简单工具

main/xiaozhi-server/core/providers/intent/nointent/nointent.py

@@ -16,5 +16,7 @@ class IntentProvider(IntentProviderBase):
         Returns:
             固定返回"继续聊天"
         """
-        logger.bind(tag=TAG).debug("Using NoIntentProvider, always returning continue chat")
-        return self.intent_options["continue_chat"]
+        logger.bind(tag=TAG).debug(
+            "Using NoIntentProvider, always returning continue chat"
+        )
+        return '{"function_call": {"name": "continue_chat"}}'