feat：PFC重构，模块化拆分

src/plugins/PFC/message_sender.py

@@ -0,0 +1,49 @@
+from typing import Optional
+from src.common.logger import get_module_logger
+from ..chat.chat_stream import ChatStream
+from ..chat.message import Message
+from ..message.message_base import Seg
+from src.plugins.chat.message import MessageSending
+
+logger = get_module_logger("message_sender")
+
+class DirectMessageSender:
+    """直接消息发送器"""
+    
+    def __init__(self):
+        pass
+        
+    async def send_message(
+        self,
+        chat_stream: ChatStream,
+        content: str,
+        reply_to_message: Optional[Message] = None,
+    ) -> None:
+        """发送消息到聊天流
+        
+        Args:
+            chat_stream: 聊天流
+            content: 消息内容
+            reply_to_message: 要回复的消息（可选）
+        """
+        try:
+            # 创建消息内容
+            segments = [Seg(type="text", data={"text": content})]
+            
+            # 检查是否需要引用回复
+            if reply_to_message:
+                reply_id = reply_to_message.message_id
+                message_sending = MessageSending(
+                    segments=segments,
+                    reply_to_id=reply_id
+                )
+            else:
+                message_sending = MessageSending(segments=segments)
+                
+            # 发送消息
+            await chat_stream.send_message(message_sending)
+            logger.info(f"消息已发送: {content}")
+            
+        except Exception as e:
+            logger.error(f"发送消息失败: {str(e)}")
+            raise