fix(server): replace unescape with decodeURIComponent

[chenjiahan]

Summary

Replace unescape with decodeURIComponent, from Node.js documentation:

The querystring.unescape() method is used by querystring.parse() and is generally not expected to be used directly.

By default, the querystring.unescape() method will attempt to use the JavaScript built-in decodeURIComponent() method to decode. If that fails, a safer equivalent that does not throw on malformed URLs will be used.

Related Links

• https://nodejs.org/api/querystring.html?utm_source=chatgpt.com#querystringunescapestr

Checklist

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

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[Copilot]

Pull Request Overview

This PR updates the URL decoding mechanism in the file resolution logic by replacing Node.js's deprecated querystring.unescape() with the standard decodeURIComponent() function. The change aligns with Node.js documentation recommendations and uses a safer, more widely supported decoding approach.

• Removes dependency on the querystring module
• Introduces a custom decodePath helper function that wraps decodeURIComponent with error handling
• Updates the pathname decoding in getFileFromUrl to use the new helper

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