feat: add Rspack support to Nuxt federation

[Nsttt]

Summary

Add first-class Rspack support to the Nuxt Module Federation module, using Nuxt's Rspack builder path while preserving the existing Vite behavior. The new path supports browser federation and true federated SSR in development and production.

Changes

• register client and server Module Federation plugins for Rspack, including portable SSR entries, manifest metadata, shared dependency handling, public paths, and server chunk publication
• add host-rspack and remote-rspack examples with production and development SSR coverage matching the Vite examples
• migrate the package build from tsdown to Rslib and publish the required runtime entries and declarations
• add a minor changeset plus regression coverage for Rspack artifacts, exposes, manifests, strict dependency layouts, and SSR recovery

Testing

• pnpm format:check
• pnpm typecheck
• pnpm build
• pnpm test (37 passing)
• pnpm build:rspack
• pnpm pack:nuxt
• pnpm changeset:status
• git diff --check origin/main...HEAD

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@module-federation/nuxt@10

commit: 59c52a0