fix: address bot identity review regressions

src/chat/replyer/group_generator.py

@@ -1115,6 +1115,10 @@ class DefaultReplyer:
         anchor_message: Optional[MaiMessage] = None,
     ) -> SessionMessage:
         """构建单个发送消息"""
+        bot_user_id = get_bot_account(self.chat_stream.platform)
+        if not bot_user_id:
+            logger.warning(f"平台 {self.chat_stream.platform} 未配置机器人账号，发送消息时回退到 QQ 账号")
+            bot_user_id = str(getattr(global_config.bot, "qq_account", "")).strip()
 
         maim_message = MessageBase(
             message_info=BaseMessageInfo(
@@ -1122,7 +1126,7 @@ class DefaultReplyer:
                 message_id=message_id,
                 time=thinking_start_time,
                 user_info=MaimUserInfo(
-                    user_id=get_bot_account(self.chat_stream.platform),
+                    user_id=bot_user_id,
                     user_nickname=global_config.bot.nickname,
                 ),
                 additional_config={},