refactor(assets-middleware): remove unused utility functions

[chenjiahan]

Summary

Remove memorize and escapeHtml utilities from the assets middleware as they don't really need to be used.

The content are fixed error messages and do not need to be escaped.

Checklist

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

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[Copilot]

Pull Request Overview

This PR removes two unused utility functions (memorize and escapeHtml) from the assets middleware to simplify the codebase. The change is based on the observation that error messages are fixed content that don't require HTML escaping.

Key changes:

• Removed the memorize wrapper from parseRangeHeaders function
• Removed HTML escaping from error message rendering
• Deleted two utility files that are no longer needed

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/core/src/server/assets-middleware/middleware.ts	Removed imports and usage of memorize and escapeHtml utilities
packages/core/src/server/assets-middleware/memorize.ts	Deleted memoization utility file
packages/core/src/server/assets-middleware/escapeHtml.ts	Deleted HTML escaping utility file

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