Decomposed the "God Class" `kdtree_analytics.go` into three distinct files:
- `kdtree_analytics.go`: Core tree analytics
- `peer_trust.go`: Peer trust scoring logic
- `nat_metrics.go`: NAT-related metrics
Renamed `ComputeDistanceDistribution` to `ComputeAxisDistributions` for clarity.
Created `AUDIT-API.md` to document the findings and changes.
Co-authored-by: Snider <631881+Snider@users.noreply.github.com>
