feat：弱引用单例

app/utils/singleton.py

@@ -1,4 +1,6 @@
 import abc
+import threading
+import weakref
 
 
 class Singleton(abc.ABCMeta, type):
@@ -40,3 +42,17 @@ class AbstractSingletonClass(abc.ABC, metaclass=SingletonClass):
     抽像类单例模式（按类）
     """
     pass
+
+
+class WeakSingleton(abc.ABCMeta, type):
+    """
+    弱引用单例模式 - 当没有强引用时自动清理
+    """
+    _instances: weakref.WeakKeyDictionary = weakref.WeakKeyDictionary()
+    _lock = threading.RLock()
+
+    def __call__(cls, *args, **kwargs):
+        with cls._lock:
+            if cls not in cls._instances:
+                cls._instances[cls] = super().__call__(*args, **kwargs)
+            return cls._instances[cls]