feat(v3.2.0): add Data+ tier and external data integrations

- introduce Data+ tier for advanced data features
- add ownership history and DNS history
- expand subdomain discovery with external sources
- add domain pricing insights
- implement local usage/credit system
- integrate external data service layer with rate limiting
- extend export and CLI for Data+ features

1 files changed, 5 insertions, 0 deletions

diff --git a/DomainDig/RDAPService.swift b/DomainDig/RDAPService.swift
index 3556624..e7e2c93 100644
--- a/DomainDig/RDAPService.swift
+++ b/DomainDig/RDAPService.swift
@@ -25,6 +25,7 @@ enum RDAPService {
         case let .success(response):
             let ownership = DomainOwnership(
                 registrar: response.registrarName,
+                registrant: response.registrantName,
                 createdDate: response.createdDate,
                 expirationDate: response.expirationDate,
                 status: response.status,
@@ -113,6 +114,10 @@ private struct RDAPDomainResponse: Decodable, Sendable {
         entities?.first(where: { $0.roles.contains("registrar") })?.bestDisplayName
     }
 
+    var registrantName: String? {
+        entities?.first(where: { $0.roles.contains("registrant") })?.bestDisplayName
+    }
+
     var createdDate: Date? {
         eventDate(for: ["registration", "registered"])
     }