fix: remove appended hint, only send pure user text to antaf

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/antaf/antaf_llm.py

@@ -90,8 +90,6 @@ class LLMProvider(LLMProviderBase):
             yield "抱歉，我没有收到您的问题。"
             return
 
-        # 追加简短回答提示，避免阿福回复过长导致TTS排队卡顿
-        query = query + "（请用2-3句话简短回答）"
         self.should_idle = False
         logger.bind(tag=TAG).info(f"AntafLLM 请求: {query[:50]}...")