🔧 Update default simple compile backend

[joerunde]

Description

Updates the default simple compile backend to inductor to match vLLM.

This could be considered slightly risky because it updates default behavior, but we do want to run with inductor where possible. This was previously set to eager because we had issues linking g++ correctly and needed a fast workaround.

Impact here should be minimal. If users run into problems with environments that don't have python headers and a valid compiler toolchain, they can run with VLLM_SPYRE_SIMPLE_COMPILE_BACKEND=eager

[github-actions]

👋 Hi! Thank you for contributing to vLLM support on Spyre.
Just a reminder: Make sure that your code passes all the linting checks, otherwise your PR won't be able to be merged. To do so, first install the linting requirements, then run format.sh and commit the changes. This can be done with uv directly:

uv sync --frozen --group lint --active --inexact

Or this can be done with pip:

uv pip compile --group lint > requirements-lint.txt
pip install -r requirements-lint.txt
bash format.sh

Now you are good to go 🚀

[gkumbhat]

Looks good to me!