docs: improve script loading documentation clarity

[chenjiahan]

Summary

• Update JSDoc and documentation to better explain html.scriptLoading behavior
• Add MDN links and reorganize content for better readability

Checklist

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

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[Copilot]

Pull Request Overview

This PR improves the documentation clarity for the html.scriptLoading configuration option by reorganizing content, adding detailed explanations for each loading mode, including MDN links, and updating JSDoc comments.

• Enhanced documentation with clearer descriptions of each script loading mode (defer, module, blocking)
• Added MDN reference links and reorganized sections for better readability
• Updated JSDoc comments to match the improved documentation style

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
website/docs/zh/config/html/script-loading.mdx	Chinese documentation improvements with reorganized sections and enhanced descriptions
website/docs/en/config/html/script-loading.mdx	English documentation improvements with reorganized sections and enhanced descriptions
packages/core/src/types/config.ts	Updated JSDoc comments to provide clearer explanations of script loading modes

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