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

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

@@ -7,6 +7,7 @@ import {
   type CascadePlan,
   type ChangelogDiff,
   type ChangelogResponse,
+  type NotificationPreferences,
   type NotificationsResponse,
   type SchemaDraft,
   type SchemaReviewQueuePage,
@@ -851,3 +852,23 @@ export const myNotificationsQuery = (unreadOnly = false, limit = 20) =>
 
 export const useMyNotifications = (unreadOnly = false, limit = 20) =>
   useQuery(myNotificationsQuery(unreadOnly, limit))
+
+/**
+ * Phase B — per-channel notification preferences для current user. GET — single
+ * row (no pagination), 401 если anonymous. Default semantics filled in
+ * backend-side когда DB row missing (email=true / express=false / telegram=false).
+ */
+export const myNotificationPreferencesQuery = () =>
+  queryOptions({
+    queryKey: ['notifications', 'me', 'preferences'] as const,
+    queryFn: async (): Promise<NotificationPreferences> => {
+      const { data } = await apiClient.get<NotificationPreferences>(
+        '/me/notifications/preferences',
+      )
+      return data
+    },
+    staleTime: 60_000, // prefs не меняются часто, кэш дольше
+  })
+
+export const useMyNotificationPreferences = () =>
+  useQuery(myNotificationPreferencesQuery())