better：重整配置，分离表达，聊天模式区分

重整配置文件路径，添加更多配置选项
分离了人设表达方式和学习到的表达方式
将聊天模式区分为normal focus和auto

src/chat/normal_chat/normal_chat.py

@@ -26,7 +26,7 @@ logger = get_logger("normal_chat")
 
 
 class NormalChat:
-    def __init__(self, chat_stream: ChatStream, interest_dict: dict = {}):
+    def __init__(self, chat_stream: ChatStream, interest_dict: dict = None):
         """初始化 NormalChat 实例。只进行同步操作。"""
 
         # Basic info from chat_stream (sync)
@@ -36,7 +36,7 @@ class NormalChat:
         self.stream_name = chat_manager.get_stream_name(self.stream_id) or self.stream_id
 
         # Interest dict
-        self.interest_dict = interest_dict
+        self.interest_dict = interest_dict or {}
 
         # --- Initialize attributes (defaults) ---
         self.is_group_chat: bool = False
@@ -200,7 +200,6 @@ class NormalChat:
                 logger.info(f"[{self.stream_name}] 兴趣监控任务被取消或置空，退出")
                 break
 
-
             items_to_process = list(self.interest_dict.items())
             if not items_to_process:
                 continue