remove & fix：移除人格表达，修复过滤词失效，私聊强制focus

src/chat/heart_flow/sub_heartflow.py

@@ -62,7 +62,10 @@ class SubHeartflow:
         """异步初始化方法，创建兴趣流并确定聊天类型"""
 
         # 根据配置决定初始状态
-        if global_config.chat.chat_mode == "focus":
+        if not self.is_group_chat:
+            logger.debug(f"{self.log_prefix} 检测到是私聊，将直接尝试进入 FOCUSED 状态。")
+            await self.change_chat_state(ChatState.FOCUSED)
+        elif global_config.chat.chat_mode == "focus":
             logger.debug(f"{self.log_prefix} 配置为 focus 模式，将直接尝试进入 FOCUSED 状态。")
             await self.change_chat_state(ChatState.FOCUSED)
         else:  # "auto" 或其他模式保持原有逻辑或默认为 NORMAL

src/chat/heart_flow/subheartflow_manager.py

@@ -91,16 +91,10 @@ class SubHeartflowManager:
                 return subflow
 
             try:
-                # 初始化子心流, 传入 mai_state_info
                 new_subflow = SubHeartflow(
                     subheartflow_id,
                 )
 
-                # 首先创建并添加聊天观察者
-                # observation = ChattingObservation(chat_id=subheartflow_id)
-                # await observation.initialize()
-                # new_subflow.add_observation(observation)
-
                 # 然后再进行异步初始化，此时 SubHeartflow 内部若需启动 HeartFChatting，就能拿到 observation
                 await new_subflow.initialize()