docs: output assetPrefix 'auto' documentation and typescript definition

[davide97g]

Summary

Modify output.assetPrefix type to include 'auto' as an option in the jsdocs and typescript types

Related Links

Fixing what was left missing in this change

Checklist

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

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1 out of 2 committers have signed the CLA.

✅ chenjiahan
❌ Davide Ghiotto

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[Copilot]

Pull Request Overview

This PR updates the output.assetPrefix configuration option to explicitly allow the string literal value 'auto' in addition to regular strings. The change addresses a gap left from a previous update by adding the 'auto' option to both the TypeScript type definition and JSDoc documentation.

Key changes:

• Updated assetPrefix type from string to string | 'auto'
• Enhanced JSDoc to document the 'auto' behavior (relative path based on file location)
• Reordered import statements (Node.js types moved after @rspack/core imports)

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[chenjiahan]

Thank you!