fix(util-genai): bump vite to 8.1.4 to clear high-severity npm audit

CI's `npm audit --audit-level=high` failed on vite 8.0.x (GHSA-fx2h-pf6j-xcff,
GHSA-v6wh-96g9-6wx3), pulled transitively via vitest. `npm audit fix` bumps
vite to 8.1.4 (lockfile-only, non-breaking). Remaining advisories are moderate
(@opentelemetry/core via optional sdk-trace-base) and do not fail the gate.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: fangxiu-wf