inherit config from main build to rsc build

[hi-ogawa]

Currently, entire configuration is hard-coded internally for rsc dev/build, but some configuration should be inherited.

vite-plugins/packages/react-server/src/plugin/index.ts

Line 109 in 48633db

const reactServerViteConfig: InlineConfig = {

Such configuration issue won't actually exit for Vite 6 environment API where users won't see 2nd dev server/build.