refactors

backend/schemas/pagination.py

@@ -0,0 +1,15 @@
+from typing import Generic, TypeVar
+
+from pydantic import BaseModel
+
+RecordT = TypeVar("RecordT", bound=BaseModel)
+
+
+class PaginatedResponse(BaseModel, Generic[RecordT]):
+    """Generic paginated response wrapper."""
+
+    records: list[RecordT]
+    total: int
+    page: int
+    per_page: int
+    total_pages: int