docs: mention @vitejs/devtools/client/inject for explicit devtools client injection

[webfansplz]

Close #262

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commit: 0128f3f

[Copilot]

Pull request overview

Introduces an explicit @vitejs/devtools/preamble entrypoint to allow DevTools client injection for apps that don’t use an index.html (e.g. micro-frontends), aligning with the request in #262.

Changes:

• Add a new Vite plugin (DevToolsPreamble) that resolves @vitejs/devtools/preamble to a virtual module importing the DevTools client injector.
• Refactor client injection URL creation into getClientInjectUrl() and reuse it across injection mechanisms.
• Document manual preamble usage for “no HTML entry” projects and wire up required dependency/exports changes.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pnpm-workspace.yaml	Adds @rolldown/pluginutils to the workspace catalog for the new preamble plugin.
pnpm-lock.yaml	Locks @rolldown/pluginutils and adds it to packages/core deps.
packages/core/types/preamble.d.ts	Adds a type-only entry for the new ./preamble export.
packages/core/src/node/plugins/preamble.ts	Implements the virtual module resolver/loader for @vitejs/devtools/preamble.
packages/core/src/node/plugins/injection.ts	Extracts getClientInjectUrl() and uses it in transformIndexHtml.
packages/core/src/node/plugins/index.ts	Registers DevToolsPreamble alongside existing core plugins.
packages/core/package.json	Adds the ./preamble export and the new dependency.
docs/guide/index.md	Documents how to import the preamble when there is no HTML entry.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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