nuxt-site-config copies every NUXT_SITE_* variable into the public site
config, so NUXT_SITE_CACHE_PURGE_TOKEN reached every page's payload as
cachePurgeToken (and NUXT_SITE_CACHE_ALLOW_PROXIED as cacheAllowProxied).
- The purge settings move to runtimeConfig cachePurge.token
(NUXT_CACHE_PURGE_TOKEN) and cachePurge.allowProxied
(NUXT_CACHE_PURGE_ALLOW_PROXIED), outside that prefix.
- The old siteCache.* names keep working for one release: a non-empty
new token wins, either allowProxied flag turns it on, and one
deprecation warning per process names the variables (never a value).
- The shared Nitro plugin server/plugins/site-cache-purge.ts strips
cachePurgeToken and cacheAllowProxied from nuxt-site-config's stack on
site-config:init, so a site on the old names leaks nothing either; it
does nothing without nuxt-site-config.
- The shared lib, route and plugin and tests/sitePurge.test.ts are
byte-identical in vue-journal-layer, vue-menu-layer and vue-faq-layer,
with three sha256 pins.
- README: new names, the deprecation, the stripping and the advice to
rotate a token ever set under the old name.
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