feat(core): devtools config

[webfansplz]

Since Vite 8 beta.13 ships with Vite DevTools (see: vitejs/vite#21331), this PR moves the config to the core repo for better flexibility. We can now drop the Vite type overrides (see: https://github.com/vitejs/devtools/blob/main/packages/kit/src/types/vite-augment.ts#L5) to fix the clientAuth config setting and typecheck CI. /cc @sapphi-red

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commit: 84f313a

[Copilot]

Pull request overview

This PR introduces a DevTools configuration system to the core package, moving configuration handling from the Vite DevTools package. This enables better type safety by avoiding Vite type overrides and allows proper configuration of the clientAuth setting.

Changes:

• Adds a new isObject utility function for type checking
• Introduces DevToolsConfig interfaces and a normalization function for handling various config input types
• Exports the new config types and functions from the core package

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
packages/core/src/node/utils.ts	Adds isObject type guard utility function for runtime object detection
packages/core/src/node/config.ts	Defines DevToolsConfig interfaces and normalizeDevToolsConfig function to handle config normalization
packages/core/src/index.ts	Exports the new config types and functions from the package

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