fix(security): close backend merge blockers

app/api/pagination.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from collections.abc import Iterable
+from typing import Generic, TypeVar
+
+T = TypeVar("T")
+
+
+class PaginatedList(list[T], Generic[T]):
+    """A page of items carrying the total count from its data source."""
+
+    def __init__(self, items: Iterable[T], *, total: int) -> None:
+        super().__init__(items)
+        self.total = total