⚡ optimize cache eviction loop in server.js

[praxstack]

• leverage Map insertion order for O(K) eviction
• use setImmediate to move eviction out of critical path
• ensure chronological order by deleting before re-setting keys

📋 Description

Brief description of the changes in this PR.

🔗 Related Issue

Fixes #(issue number)

🔄 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• ♻️ Refactoring (no functional changes)
• 🔒 Security fix

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✅ Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: cc0b5a31-673b-461c-83c6-7d2493d44497

📥 Commits

Reviewing files that changed from the base of the PR and between 41121bd and 4f677f7.

📒 Files selected for processing (1)

• server.js

✨ Finishing Touches

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• Commit unit tests in branch perf-optimize-cache-eviction-884178005553829542

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