[Bug]: `dev.assetPrefix` leaks to Node env in multi enviroment setup

[felixmosh]

Version

System:
    OS: macOS 26.0.1
    CPU: (12) arm64 Apple M3 Pro
    Memory: 546.80 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 142.0.7444.60
    Firefox: 142.0.1
    Safari: 26.0.1
  npmPackages:
    @rsbuild/core: 1.6.3

Details

when bundling server code, dev.assetPrefix is used for node files as well (on dev only) and this breaks imports of worker_threads.

import {Worker} from 'worker_threads';

const worker = new Worker(new URL('./worker.ts', import.meta.url));

Reproduce link

https://github.com/felixmosh/rsbuild-bug-assetprefix

Reproduce Steps

On dev

1. pnpm install
2. pnpm dev (files should be generated)
3. exit
4. node dist/server/index.js

// fails since dev.assetPrefix is used (not relevant for node env IMO)

On build

1. pnpm build
2. node dist/server/index.js

// fails since output.assetPrefix on node enviroment is ignored and set to be / which is an absolute path = new URL uses only it.

[chenjiahan]

See: #3220 (comment)

This is because node bundles are usually built for SSR and should use the same asset prefix as the web bundles, otherwise there may be some SSR hydration mismatch errors.

[chenjiahan]

We might need a solution to allow SSR bundles to correctly reference worker bundles.