Next.js 16 Cache Components - PPR, use cache directive, cacheLife, cacheTag, updateTag
Initial release: Brings Next.js 16 Cache Components support for Partial Prerendering (PPR) and advanced caching directives. - Adds `cacheComponents` config flag to enable cache components (supersedes experimental.ppr). - Supports `use cache` directive at file, component, or function level for caching async data. - Introduces `cacheLife`, `cacheTag`, and `updateTag` helpers for powerful cache profiles and invalidation. - Documents cache key generation, restrictions, and migration from earlier Next.js caching APIs. - Provides examples for static, cached, and dynamic content mixing within a page.