增加一些配置性工作

utils/sing.py

@@ -0,0 +1,22 @@
+from typing import Callable, Generic, TypeVar
+
+T = TypeVar("T")
+
+
+class SingletonProvider(Generic[T]):
+    def __init__(self, factory: Callable[[], T]):
+        self._factory = factory
+        self._instance: T | None = None
+
+    def __call__(self) -> T:
+        if self._instance is None:
+            self._instance = self._factory()
+        return self._instance
+
+    def reset(self) -> None:
+        """重置单例（测试 / 热重载用）"""
+        self._instance = None
+
+    def warmup(self) -> T:
+        """提前初始化"""
+        return self()