astro@7 docs build fails: root vite ^7.3.5 override downgrades astro's vite 8

Trap: astro build in docs/ fails with rollupOptions.input should not be an html file when building for SSR after rebasing onto master. Looks like a vite 7.x SSR regression. Root cause: master's root pnpm.overrides has vite: ^7.3.5 (root CVE fix); astro@7.1.4 requires vite ^8.0.13, so the root override DOWNGRADES astro's vite to 7.x, which astro 7's static-build cannot consume. Fix: add docs-local pnpm.overrides vite: ^8.0.0 (or ^8.0.13) — pnpm's most-specific workspace-local override wins for the docs subtree, leaving root on vite 7. Verified: docs build succeeds with vite@8.1.5.