v4.7.0: Add domain reputation/blocklist data source

- New DomainReputationResult model (status: clean/listed/unknown, listed
  sources, checked-at) and a `reputation(domain:)` method on ExternalDataService,
  mirroring the existing pluggable-URL enrichment pattern (ownership history,
  DNS history, extended subdomains, pricing). With no endpoint configured
  (the default; DomainDig ships no bundled third-party reputation dependency)
  it resolves to unavailable rather than "clean".
- New .reputation FeatureCapability/DataCapability, gated Pro+ like domainPricing.
- Threaded reputation/reputationError through LookupSnapshot and HistoryEntry
  (backward-compatible decode) so results persist with history entries.
- Auto-fetched in performLookup alongside pricing; surfaced as a "Reputation"
  info row, folded into DomainInsightEngine's risk score/factors and top-level
  insights (a listed domain raises risk score and adds a factor/insight), and
  exported in text, CSV, and JSON report output.
- Reputation-driven risk changes ride the existing change-severity pipeline, so
  a listed status flip is visible to monitoring the same way any other risk
  delta is, without bespoke monitoring wiring.

1 files changed, 4 insertions, 0 deletions

diff --git a/DomainDig/DomainMonitoringService.swift b/DomainDig/DomainMonitoringService.swift
index 3229fb7..6fb5fc9 100644
--- a/DomainDig/DomainMonitoringService.swift
+++ b/DomainDig/DomainMonitoringService.swift
@@ -516,6 +516,7 @@ final class DomainMonitoringService {
             extendedSubdomains: snapshot.extendedSubdomains,
             dnsHistory: snapshot.dnsHistory,
             domainPricing: snapshot.domainPricing,
+            reputation: snapshot.reputation,
             portScanResults: snapshot.portScanResults,
             hstsPreloaded: snapshot.hstsPreloaded,
             availabilityResult: snapshot.availabilityResult,
@@ -554,6 +555,7 @@ final class DomainMonitoringService {
             extendedSubdomainsError: snapshot.extendedSubdomainsError,
             dnsHistoryError: snapshot.dnsHistoryError,
             domainPricingError: snapshot.domainPricingError,
+            reputationError: snapshot.reputationError,
             portScanError: snapshot.portScanError
         )
 
@@ -930,6 +932,8 @@ final class DomainMonitoringService {
             dnsHistoryError: previousSnapshot.dnsHistoryError,
             domainPricing: previousSnapshot.domainPricing,
             domainPricingError: previousSnapshot.domainPricingError,
+            reputation: previousSnapshot.reputation,
+            reputationError: previousSnapshot.reputationError,
             portScanResults: previousSnapshot.portScanResults,
             portScanError: previousSnapshot.portScanError,
             changeSummary: previousSnapshot.changeSummary,