Support respecting `moduleType` in internal plugins

[nia3y]

Describe the bug

i write a plugin transform markdown to jsx, the result include moduleType: 'jsx'，but oxc not handle this result

minimal reproducible example

1. markdown to jsx plugin

import type { Plugin } from 'vite';

export function mdToJsx(): Plugin {
  return {
    name: 'vite:md-to-jsx',
    transform: {
      order: 'pre',
      filter: {
        id: /\.md$/,
      },
      async handler(src: string) {
        const code = `export default function MDContent() {
                                  return <div>hello</div>
                                };`
        return {
          code,
          moduleType: 'jsx',
        };
      },
    },
  };
}

2. config rolldown-vite with enableNativePlugin: true, resolve extensions includes .md and mdToJsx plugin

import { defineConfig } from 'vite';
import { mdToJsx } from './plugins/md-to-jsx.mjs';

export default defineConfig({
  experimental: {
    enableNativePlugin: true,
  },
  oxc: {
    include: /\.(m?ts|[jt]sx|md)$/,
  },
  resolve: {
    extensions: ['.mjs', '.js', '.mts', '.ts', '.jsx', '.tsx', '.json', '.md'],
  },
  plugins: [mdToJsx()],
});

Reproduction

https://stackblitz.com/edit/vitejs-rolldown-vite-ygquhwyz?file=vite.config.mjs,plugins%2Fmd-to-jsx.mjs

Steps to reproduce

No response

System Info

System:
    OS: Linux 6.15 Manjaro Linux
    CPU: (16) x64 AMD Ryzen 9 7940HS w/ Radeon 780M Graphics
    Memory: 17.43 GB / 29.15 GB
    Container: Yes
    Shell: 5.9 - /usr/bin/zsh
  Binaries:
    Node: 24.4.1 - /usr/bin/node
    Yarn: 1.22.22 - /usr/bin/yarn
    npm: 11.4.2 - /usr/bin/npm
    pnpm: 10.13.1 - /usr/bin/pnpm

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

I plan to add this feature.
But for now, I'd like to avoid introducing this behavior until rolldown/rolldown#4004 is implemented and Vite migrates to rolldown-vite, to avoid confusion.

You can achieve the same thing with the code I wrote in vitejs#20102.