feat: Vite 8 support and Rolldown/Oxc migration

[semoal]

Summary

This backports Vite 8 support to vite-plugin-node and aligns plugin internals/docs with the Vite 8 toolchain (Rolldown + Oxc), while keeping SWC as an opt-in path.

Why this backport

Vite 8 switched core internals from Rollup/esbuild to Rolldown/Oxc. The plugin still carried Vite 7-era config and terminology (rollupOptions, esbuild defaults), which creates drift and deprecation risk for users upgrading to Vite 8.

What changed

1) Vite 8 compatibility and version alignment

• Bumped workspace catalog to Vite 8 (pnpm-workspace.yaml).
• Bumped package version to 8.0.0 (packages/vite-plugin-node/package.json).

2) Config migration for Vite 8

• Migrated internal build config from build.rollupOptions to build.rolldownOptions.
• In SWC mode, switched from disabling esbuild to disabling oxc:
  • plugincConfig.esbuild = false -> plugincConfig.oxc = false.

3) Compiler mode/API cleanup

• SupportedTSCompiler changed from 'esbuild' | 'swc' to 'vite' | 'swc'.
• Default compiler mode changed to 'vite' (Vite default transformer pipeline).
• Updated README examples and wording accordingly.

4) Output format constraints for Rolldown

• Removed unsupported format values from exported types:
  • removed: amd, system, systemjs
  • retained: cjs, es, iife, umd, commonjs, esm, module

5) SWC transform plugin cleanup

• Replaced @rollup/pluginutils usage with createFilter exported by vite.
• Removed now-unused @rollup/pluginutils dependency.

6) TypeScript build config update

• Updated package tsconfig to NodeNext so Vite 8 ESM types resolve correctly:
  • moduleResolution: "NodeNext"
  • module: "NodeNext"

7) Documentation/changelog

• Added 8.x.x -> 8.x.x mapping row in both README files.
• Updated compiler/default comments and architecture wording.
• Added 8.0.0 changelog entry with breaking changes and migration notes.

Breaking changes

• tsCompiler no longer accepts 'esbuild'; use 'vite' or 'swc'.
• outputFormat no longer accepts amd, system, systemjs.

Validation

Ran in this branch:

• pnpm --filter vite-plugin-node lint ✅
• pnpm --filter vite-plugin-node build-dist ✅
• pnpm link and tested the HMR and build command in our monorepo with a large API powered by Fastify ✅

Branch / commit

• Branch: backport/vite8-rolldown-oxc
• Commit: cdbc163