fix: add __future__ annotations to resolve 'function' object is not subscriptable

The CollectionStore class defines a method named `list` (line 123). In Python,
class-body annotations are evaluated eagerly in the class namespace. After the
`list` method is defined, any annotation using `list[...]` (lines 222, 255, 287,
299, 312, 327) resolves to the method object rather than the built-in list type,
causing TypeError: 'function' object is not subscriptable at class definition time.

Adding `from __future__ import annotations` defers all annotation evaluation to
string form, avoiding the name-shadowing issue without changing any runtime logic.

https://claude.ai/code/session_01U6Cp66NKhLL8k8VRifboXk

Author: claude

tiklocal/services/collections.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import datetime
 import json
 import os