feat: add TypeScript IntelliSense support with eslint-typegen

[2nofa11]

Summary

Add TypeScript IntelliSense support via eslint-typegen with ESM migration for ESLint v9.0+ compatibility.

Changes

• Integrate eslint-typegen for TypeScript definitions
• Convert eslint.config.js to eslint.config.mjs (required for eslint-typegen)
• Update all imports to ESM format

Benefits

• TypeScript IntelliSense for ESLint configurations
• Modern ESLint v9.0+ compatibility
• Improved developer experience with type safety

Screenshot

Before(No TypeScript Support)	After(TypeScript IntelliSense Active)

close #2757

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🦋 Changeset detected

Latest commit: 9e53387

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

This PR includes changesets to release 1 package

Name	Type
eslint-plugin-vue	Minor

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[ota-meshi]

Thank you for this PR!
Furthermore, can you make it so that we can provide rule types from this package using the low-level API?
https://github.com/antfu/eslint-typegen/blob/main/README.md#low-level-api

[2nofa11]

@ota-meshi
I've implemented rule type generation using eslint-typegen's low-level API. (856784e)

Implementation:

• Added npm run typegen command (like that @antfu/eslint-config)
• Uses pluginsToRulesDTS from eslint-typegen/core
• Generated file lib/eslint-typegen.d.ts is currently gitignored

Should I also add lib/eslint-typegen.d.ts to this PR, or would you prefer CI automation for the distribution strategy?

[ota-meshi]

LGTM! Thank you!

[FloEdelmann]

Looks good to me, too. Thank you 🙂