[feat] Add knip for unused code detection

[huchenlei]

Summary

• Add knip to detect unused files, exports, and dependencies
• Configure knip with minimal rules (unused files only initially)
• Add knip to CI pipeline for automated checks
• Add npm scripts for running knip locally

Related Issues

Tracks gradual enablement of additional knip rules: #4888
Continued on #4886

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	knip@​5.62.0

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[christian-byrne]

LGTM!