Refactor kdtree_analytics.go and Create API Audit

[Snider]

This change addresses the "God Class" issue in kdtree_analytics.go by decomposing it into smaller, more focused modules. It also includes an API audit report that documents the changes and findings.

Fixes #27

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PR created automatically by Jules for task 3674138560719972443 started by @Snider

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch api-audit-refactor-3674138560719972443

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[codecov]

Codecov Report

❌ Patch coverage is 86.84211% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
nat_metrics.go	83.05%	10 Missing ⚠️

📢 Thoughts on this report? Let us know!