refactor: standardize runtime annotation types across multiple files

backend/app/schemas/users.py

@@ -2,10 +2,12 @@
 
 from __future__ import annotations
 
-from uuid import UUID  # noqa: TCH003
+from uuid import UUID
 
 from sqlmodel import SQLModel
 
+RUNTIME_ANNOTATION_TYPES = (UUID,)
+
 
 class UserBase(SQLModel):
     """Common user profile fields shared across user payload schemas."""