Add Nitro and Nuxt integration entries

[onmax]

Refactors runtime config validation around explicit nuxt-safe-runtime-config/nitro and nuxt-safe-runtime-config/nuxt package entries while keeping the root import as the backward-compatible Nuxt module.

The Nitro entry now owns build-time validation, runtime validation plugin registration, generated validation artifacts, and the thin Nitro v3/v2 runtime-config import fallback. The Nuxt adapter delegates validation into Nitro, keeps auto-imported useSafeRuntimeConfig() types, and leaves the existing Shelve integration on the Nuxt/root path only.

This also adds Nitro-only fixture coverage, Nuxt build regression coverage for Nitro-owned validation artifacts and build validation failures, and extends the packed-release smoke test with a Nitro consumer that imports /nitro without installing Nuxt. Docs now clarify that generated validation artifact paths are internal implementation details.

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Project	Deployment	Actions	Updated (UTC)
nuxt-safe-runtime-config	Ready	Preview, Comment	May 22, 2026 12:15pm
safe-runtime-config	Ready	Preview, Comment	May 22, 2026 12:15pm

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