feat(monitoring): attribute SaaS citations by registrable domain

Persist host/registrable_domain/site_key on monitoring article URL
aliases, populate them on desktop-publish completion, and use them in
the citation pipeline to count how often SaaS-published content
appears as a citation source. Expose a /citation-summary endpoint with
a 7/30-day window switch and surface the new source-share metrics in
the tracking dashboard.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/lib/api.ts

@@ -57,6 +57,7 @@ import type {
   LoginResponse,
   MediaPlatform,
   MonitoringCollectNowResponse,
+  MonitoringCitationSummaryResponse,
   MonitoringDashboardCompositeResponse,
   MonitoringQuestionDetailResponse,
   PlatformAccount,
@@ -1075,6 +1076,13 @@ export const monitoringApi = {
       params,
     });
   },
+  citationSummary(params: {
+    days?: number;
+  }) {
+    return apiClient.get<MonitoringCitationSummaryResponse>("/api/tenant/monitoring/citation-summary", {
+      params,
+    });
+  },
   questionDetail(
     brandId: number,
     questionId: number,