The docs site analytics id is Universal Analytics, which stopped recording in 2023

`docs/.vuepress/config.ts` configures `googleAnalyticsPlugin({ id: 'UA-1433901-1' })` — a Universal Analytics property, which Google stopped processing in July 2023. The site has recorded nothing since, so there is no page-level signal of which docs are read. Swap to a GA4 measurement id (`G-…`) if measurement matters; the id has to come from the maintainer's account. Docs-only.