refactor: 将多个方法修改为静态方法以提高代码可读性和一致性

src/heart_flow/heartflow.py

@@ -105,7 +105,8 @@ class Heartflow:
         # 启动子心流更新任务
         asyncio.create_task(self._sub_heartflow_update())
 
-    async def _update_current_state(self):
+    @staticmethod
+    async def _update_current_state():
         print("TODO")
 
     async def do_a_thinking(self):

src/heart_flow/observation.py

@@ -161,7 +161,8 @@ class ChattingObservation(Observation):
         # print(f"prompt：{prompt}")
         # print(f"self.observe_info：{self.observe_info}")
 
-    def translate_message_list_to_str(self, talking_message):
+    @staticmethod
+    def translate_message_list_to_str(talking_message):
         talking_message_str = ""
         for message in talking_message:
             talking_message_str += message["detailed_plain_text"]