perf(server): lazy load range-parser

[chenjiahan]

Summary

Use dynamic import for range-parser to defer loading until needed (it's not used in most cases).

Checklist

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

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[Copilot]

Pull Request Overview

This PR optimizes the server's assets middleware by converting the range-parser import from static to dynamic loading, deferring the module load until it's actually needed for range request parsing.

Key Changes:

• Converted parseRangeHeaders to an async function that dynamically imports range-parser
• Updated the function call site to use await when invoking parseRangeHeaders

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