feat(admin-ui): Phase B frontend — notifications preferences route + UI

ordinis-admin-ui/src/api/client.ts

@@ -719,3 +719,18 @@ export type NotificationsResponse = {
   /** Unread count for badge — pre-filtered server-side. */
   totalUnread: number
 }
+
+/**
+ * Phase B — per-channel notification opt-in/out для current user. Backend
+ * endpoint: GET/PUT /api/v1/me/notifications/preferences. Default semantics
+ * (server-side, when row missing): email=true, express=false, telegram=false.
+ *
+ * <p>Express/Telegram channels пока not wired backend-side — toggles в UI
+ * disabled с tooltip 'Скоро'. Email — единственный фактически работающий
+ * канал в Phase A/B.
+ */
+export type NotificationPreferences = {
+  email: boolean
+  express: boolean
+  telegram: boolean
+}