feat(notifications): Phase B backend — per-user channel preferences

ordinis-notifications/src/test/java/cloud/nstart/terravault/ordinis/notifications/dispatcher/NotificationsDispatcherTest.java

@@ -75,6 +75,14 @@ class NotificationsDispatcherTest {
     notificationLogRepository = new StubNotificationLogRepository();
     idempotencyGuard = new StubIdempotencyGuard(notificationLogRepository);
 
+    // Phase B: UserPreferencesGate — stub all-allow для existing tests (no
+    // prefs row → defaults apply, email ON). Per-channel skip tested separately.
+    UserPreferencesGate allAllowGate = new UserPreferencesGate(null) {
+      @Override
+      public boolean allows(String userId, cloud.nstart.terravault.ordinis.notifications.channel.ChannelKind channel) {
+        return true;
+      }
+    };
     dispatcher = new NotificationsDispatcher(
         outboxRepository,
         notificationLogRepository,
@@ -82,6 +90,7 @@ class NotificationsDispatcherTest {
         messageRenderer,
         List.of(emailChannel),
         recipientResolver,
+        allAllowGate,
         new SimpleMeterRegistry()
     );