fix: replace the deprecated url.parse in assets middleware

[chenjiahan]

Summary

Replace the deprecated url.parse and memoized function with direct URL constructor.

url.parse has been deprecated since Node 24:

Related Links

• fix: remove the deprecated url.parse from historyApiFallback #5696

Checklist

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

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[Copilot]

Pull Request Overview

This PR replaces the deprecated url.parse function with the modern URL constructor in the assets middleware. The deprecated url.parse was causing warnings in Node.js 24+.

• Removes dependency on deprecated url.parse and associated memoization
• Simplifies URL parsing logic using the standard URL constructor
• Maintains the same URL decoding functionality with qsUnescape

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