set up next.js app and static build

[DaltheCow]

This is a starter next.js app set up for static builds (static site generation comes from output: 'export' in the next.config.ts). It uses the 'use client' directive to tell Next.js to treat everything as client side code in the page.tsx file meaning that most of the app won't be prerendered. This mirrors our set up since we use MUI theming and CSS in JS which require most of the app to be client code.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/guidellm/actions/runs/14936655201/artifacts/3096583956.
They will be retained for up to 30 days.

[DaltheCow]

My main open question for this PR is should we already include base github workflows that ensure the basics work. I'll probably just add those in the next PR

[DaltheCow]

I suppose at the least the failing workflows will need updating

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/guidellm/actions/runs/14937188832/artifacts/3096779866.
They will be retained for up to 30 days.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/guidellm/actions/runs/14984151213/artifacts/3110201004.
They will be retained for up to 30 days.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/guidellm/actions/runs/15000849591/artifacts/3115813534.
They will be retained for up to 30 days.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/guidellm/actions/runs/15000907321/artifacts/3115835217.
They will be retained for up to 30 days.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/guidellm/actions/runs/15001105889/artifacts/3115907232.
They will be retained for up to 30 days.

[sjmonson]

Looks good but needs linting fixes