Docs: Confusing ONNX Runtime warning on Windows 11 during backend tests and local run

### Is there an existing issue for this?

- [x] I have searched the existing issues

### What happened?

Description:
While running PictoPy backend locally on Windows 11, I consistently see ONNX Runtime warnings related to Windows version support. Although the backend works correctly and all tests pass, the warning is confusing for new contributors.

Environment:

OS: Windows 11

Python: 3.12

Backend: FastAPI

ONNX Runtime

Steps to reproduce:

Set up backend following the documentation

Run backend tests:

pytest

or run backend:

uvicorn main:app --reload

Observed warning:

UserWarning: Unsupported Windows version (11).
ONNX Runtime supports Windows 10 and above.

Observed behavior:

Backend works correctly

All tests pass successfully (100+ tests passed)

No runtime failure occurs

Expected behavior:

Either:

The warning should be clarified in documentation, or

The warning message should be less alarming for supported Windows versions

Why this matters:

New contributors may assume backend setup is broken

This is especially confusing during first-time setup on Windows

Suggestion:

Add a short note in backend setup / troubleshooting docs explaining that this warning is harmless if tests pass.

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