feat(create-rsbuild): enable ts check for JS config files

[chenjiahan]

Summary

Enable TypeScript check for JS config files in templates, helping users to identify invalid configurations.

Links

https://www.typescriptlang.org/docs/handbook/intro-to-js-ts.html#ts-check

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR adds TypeScript checking to JavaScript configuration files in create-rsbuild templates by adding the // @ts-check directive to all JS template config files.

• Adds // @ts-check comment to all JavaScript rsbuild.config.mjs files
• Enables TypeScript type checking for JavaScript configuration files
• Helps users identify invalid configurations early in development

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/create-rsbuild/template-vue3-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-vue2-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-vanilla-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-svelte-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-solid-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-react18-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-react-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-preact-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking
packages/create-rsbuild/template-lit-js/rsbuild.config.mjs	Added // @ts-check directive for TypeScript checking

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