fix(django-cf): fix order_by not working properly

[ryanking13]

Fixes a bug that the fetch order is always fixed for the d1, do backend.

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

This PR replaces the destructive list.pop() approach in CFResult.fetchone/fetchall/fetchmany with a position-based cursor, fixing the ordering bug and preserving the underlying data.

1. Missing _position initialization (high severity): self._position is referenced by all three fetch methods but is never set in __init__. Every call to fetchone(), fetchall(), or fetchmany() will raise AttributeError. Add self._position = 0 in CFResult.__init__.

One inline comment was submitted with this finding.

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[dom96]

Curious why the changes to packages/django-cf/django_cf/db/base_engine.py are needed, but otherwise looks good.