refactor(notifications): remove factory indirection, interface, and listener duplication

Remove NotificationRepositoryFactory, NotificationServicesFactory, and
NotificationRepositoryInterface — all single-consumer abstractions with
no polymorphism benefit. Simplify container registrar to wire services
directly. Extract shared listener logic (sanitizeTenantIds,
resolveDisplayName, resolveUuid) into NotificationListenerTrait,
eliminating duplication across 4 listeners.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/notifications/lib/Module/Notifications/Repository/NotificationRepository.php

@@ -5,7 +5,7 @@ namespace MintyPHP\Module\Notifications\Repository;
 use MintyPHP\DB;
 use MintyPHP\Repository\Support\RepositoryArrayHelper;
 
-class NotificationRepository implements NotificationRepositoryInterface
+class NotificationRepository
 {
     private const DEDUPE_WINDOW_SECONDS = 1800;
 

modules/notifications/lib/Module/Notifications/Repository/NotificationRepositoryInterface.php

@@ -1,26 +0,0 @@
-<?php
-
-namespace MintyPHP\Module\Notifications\Repository;
-
-interface NotificationRepositoryInterface
-{
-    /** @return int|false Insert ID on success, false on failure */
-    public function create(array $data): int|false;
-
-    /**
-     * @return list<array<string, mixed>>
-     */
-    public function listByUser(int $userId, ?int $tenantId, int $limit, int $offset): array;
-
-    public function countUnreadByUser(int $userId, ?int $tenantId): int;
-
-    public function markRead(int $id, int $userId, ?int $tenantId): bool;
-
-    public function markAllReadByUser(int $userId, ?int $tenantId): int;
-
-    public function delete(int $id, int $userId, ?int $tenantId): bool;
-
-    public function deleteAllByUser(int $userId): int;
-
-    public function purgeReadOlderThanDays(int $days): int;
-}