feat: add source.enableAsyncPreEntry for async entry

[2heal1]

Summary

• add source.enableAsyncPreEntry config
• only enable it when source.enableAsyncEntry is turned on
• inject source.preEntry imports at the top of generated index.jsx
• stop passing source.preEntry to builder when async pre-entry handling is enabled
• add docs for the new config and describe the generated output
• add integration tests for async entry + preEntry behavior

Details

When source.enableAsyncEntry is enabled, the final build entry becomes bootstrap.jsx, so builder-side source.preEntry does not reliably affect the real entry code.

This change introduces source.enableAsyncPreEntry to handle that case in Modern.js entry generation:

• bootstrap.jsx remains the async boundary
• index.jsx becomes the place where preEntry imports are injected
• preEntry runs before the real entry logic in async entry scenarios

Testing

• add integration test to verify preEntry is injected into index.jsx
• verify bootstrap.jsx does not contain preEntry
• verify preEntry code is executed in the browser

[changeset-bot]

🦋 Changeset detected

Latest commit: b2c9dff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 117 packages

Name	Type
@modern-js/app-tools	Minor
@modern-js/runtime	Minor
@modern-js/adapter-rstest	Minor
@modern-js/plugin-bff	Minor
@modern-js/plugin-ssg	Minor
@modern-js/plugin-styled-components	Minor
@modern-js/plugin-i18n	Minor
@modern-js/image	Minor
@modern-js/plugin-polyfill	Minor
@integration-test/alias-set	Patch
app-document	Patch
async-entry-test	Patch
tmp	Patch
bff-api-app	Patch
bff-client-app	Patch
bff-indep-client-app	Patch
bff-hono	Patch
integration-clean-dist-path	Patch
integration-compatibility	Patch
integration-custom-dist-path	Patch
custom-file-system-entry	Patch
integration-custom-template	Patch
deploy	Patch
deploy-server	Patch
dev-server	Patch
integration-disable-html	Patch
entries-app-builder	Patch
app-custom-entries	Patch
app-custom-routes-runtime	Patch
app-custom	Patch
app-entry	Patch
app-route	Patch
app-entry-server	Patch
i18n-app-csr-html-lang	Patch
i18n-app	Patch
i18n-app-ssr-html-lang	Patch
i18n-app-ssr	Patch
i18n-custom-i18n-wrapper	Patch
i18n-mf-app-provider	Patch
i18n-mf-component-provider	Patch
i18n-mf-consumer	Patch
i18n-routes	Patch
i18n-routes-ssr	Patch
@integration-test/image-component	Patch
main-entry-name	Patch
nonce	Patch
pure-esm-project	Patch
routes-match	Patch
routes	Patch
app-rsbuild-hooks	Patch
rsc-csr-app	Patch
rsc-csr-routes	Patch
rsc-ssr-app	Patch
rsc-ssr-routes	Patch
basic-app-rstest-browser	Patch
basic-app-rstest	Patch
runtime-custom-plugin	Patch
runtime-custom-config-plugin	Patch
select-mul-entry-test	Patch
select-one-entry-test	Patch
server-config	Patch
server-json-script	Patch
server-monitors	Patch
server-prod	Patch
server-routes	Patch
@source-code-build/app	Patch
ssg-fixtures-mega-list-routes	Patch
ssg-fixtures-nested-routes	Patch
ssg-fixtures-simple	Patch
ssg-fixtures-web-server	Patch
ssr-base-async-entry-test	Patch
ssr-base-async-pre-entry-test	Patch
ssr-base-json-test	Patch
ssr-base-test	Patch
ssr-base-fallback-test	Patch
init	Patch
ssr-base-loadable	Patch
ssr-partial-test	Patch
rsc-closing-tags-test	Patch
ssr-script-loading	Patch
ssr-useid-test	Patch
ssr-streaming-inline-test	Patch
ssr-streaming-test	Patch
integration-storybook	Patch
styled-components-stream	Patch
styled-components-string	Patch
integration-tailwindcss-v2	Patch
integration-tailwindcss-v3	Patch
integration-tailwindcss-v4-tools	Patch
integration-tailwindcss-v4	Patch
tmp-dir	Patch
write-to-dist	Patch
@modern-js/bundle-diff-benchmark	Minor
@modern-js/main-doc	Minor
@modern-js/tsconfig	Minor
@modern-js/builder	Minor
@modern-js/plugin-data-loader	Minor
@modern-js/render	Minor
@modern-js/bff-core	Minor
@modern-js/bff-runtime	Minor
@modern-js/server-core	Minor
@modern-js/create-request	Minor
@modern-js/prod-server	Minor
@modern-js/server-runtime	Minor
@modern-js/server	Minor
@modern-js/server-utils	Minor
@modern-js/create	Minor
@modern-js/i18n-utils	Minor
@modern-js/plugin	Minor
@modern-js/runtime-utils	Minor
@modern-js/sandpack-react	Minor
@modern-js/types	Minor
@modern-js/utils	Minor
@modern-js/rslib	Minor
@scripts/prebundle	Patch
@scripts/rstest-config	Patch
@scripts/release-node	Patch

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