Refactor entity detail selection

[ktsaou]

Summary

• move selected entity detail aggregation into a dedicated builder
• split target initialization, feed ordering, country/ASN contributions, and final sidecar construction
• cover country and ASN target detection helpers

Validation

• go test ./pkg/engine
• go test -coverprofile=/tmp/update-ipsets-engine-slice24.cover -covermode=atomic ./pkg/engine
• go run ./tools/archposture -root . > /tmp/update-ipsets-archposture-slice24.json
• make lint
• make staticcheck
• make golangci-lint
• CI=true make coverage
• make test-strict
• git diff --check

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 20 complexity · -2 duplication

Metric	Results
Complexity	20
Duplication	-2

View in Codacy

AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}