feat: 增加适用于直播等场景的新回复策略，在ada发送特定消息段的情况下可以按照优先度同一时间只回复一人

src/chat/message_receive/chat_stream.py

@@ -47,6 +47,16 @@ class ChatMessageContext:
                 return False
         return True
 
+    def get_priority_mode(self) -> str:
+        """获取优先级模式"""
+        return self.message.priority_mode
+
+    def get_priority_info(self) -> Optional[dict]:
+        """获取优先级信息"""
+        if hasattr(self.message, "priority_info") and self.message.priority_info:
+            return self.message.priority_info
+        return None
+
 
 class ChatStream:
     """聊天流对象，存储一个完整的聊天上下文"""