fix：进一步模块化，修复观察错位问题

src/heart_flow/observation.py

@@ -22,6 +22,9 @@ class Observation:
         self.observe_type = observe_type
         self.observe_id = observe_id
         self.last_observe_time = datetime.now().timestamp()  # 初始化为当前时间
+    
+    async def observe(self):
+        pass
 
 
 # 聊天观察