refactor(replyer): 优化用户ID获取逻辑，简化自我回复判断

src/chat/replyer/default_generator.py

@@ -1870,10 +1870,12 @@ class DefaultReplyer:
 
     async def build_relation_info(self, sender: str, target: str):
         # 获取用户ID
+        if sender == f"{global_config.bot.nickname}(你)":
+            return f"你将要回复的是你自己发送的消息。"
+        
         person_info_manager = get_person_info_manager()
         person_id = await person_info_manager.get_person_id_by_person_name(sender)
-        if person_id == "SELF":
-            return f"你将要回复的是你自己发送的消息。"
+
         if not person_id:
             logger.warning(f"未找到用户 {sender} 的ID，跳过信息提取")
             return f"你完全不认识{sender}，不理解ta的相关信息。"

src/person_info/person_info.py

@@ -132,8 +132,6 @@ class PersonInfoManager:
         若未命中则查询数据库并更新缓存。
         """
         try:
-            if person_name == f"{global_config.bot.nickname}(你)":
-                return "SELF"
             # 优先使用内存缓存加速查找：self.person_name_list maps person_id -> person_name
             for pid, pname in self.person_name_list.items():
                 if pname == person_name: