feat(webhooks): stats cards dashboard на subscription detail

ordinis-admin-ui/src/routes/webhooks.$id.tsx

@@ -36,6 +36,7 @@ import {
 } from '@/api/mutations'
 import type { WebhookTestPingResult } from '@/api/client'
 import { SCOPE_DOT } from '@/lib/scope-style'
+import { WebhookStatsCards } from '@/components/webhooks/WebhookStatsCards'
 
 export const Route = createFileRoute('/webhooks/$id')({
   component: WebhookDetailPage,
@@ -205,6 +206,11 @@ function WebhookDetailPage() {
         </div>
       </Panel>
 
+      {/* Stats cards — счётчики per status + success rate. Aggregate
+          из 4 параллельных queries с size=1 (cheap). Visual time-series
+          chart — deferred follow-up (требует /stats endpoint). */}
+      <WebhookStatsCards subscriptionId={id} />
+
       <div>
         <div className="flex items-center justify-between mb-3">
           <h2 className="font-sans text-title-md text-accent">