Fix notifications not detecting comment events

AuditLogModel::logCommentCreate logs comments with action_type='comment'
not 'create'. The notification query was filtering on action_type='create'
only, so comment events on watched/owned tickets were never surfaced.

Widen the filter to IN ('comment', 'create') to match the actual logged
values while staying compatible with any legacy entries.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/notifications.php

@@ -92,7 +92,7 @@ $commentSql = "SELECT
     COALESCE(u.display_name, u.username, 'System') AS actor_name
   FROM audit_log al
   LEFT JOIN users u ON al.user_id = u.user_id
-  WHERE al.action_type = 'create'
+  WHERE al.action_type IN ('comment', 'create')
     AND al.entity_type = 'comment'
     AND al.user_id != ?
     AND al.created_at >= DATE_SUB(NOW(), INTERVAL 7 DAY)