refactor(server): refactor error handling using http code enum

[chenjiahan]

Summary

• Refactor error handling using HttpCode enum
• Improve logging for malicious and invalid paths

Checklist

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

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[Copilot]

Pull Request Overview

This PR refactors error handling in the assets middleware by introducing an HttpCode enum to replace magic numbers and improves logging for specific error cases.

• Introduced HttpCode enum to replace hardcoded HTTP status codes throughout the middleware
• Added explicit error logging for malicious paths (403) and invalid pathnames (400)
• Refactored sendError function to accept HttpCode enum values and moved error message mapping inside the function

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/server/assets-middleware/middleware.ts	Introduced HttpCode enum, refactored sendError function signature, replaced magic numbers with enum values, and added error logging for BadRequest cases
packages/core/src/server/assets-middleware/getFileFromUrl.ts	Updated return type to use HttpCode enum, inlined pathname decoding logic, and replaced magic numbers with enum values

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