fix(queue): route scheduled jobs through crons helper

Centralize scheduled job queue selection with crons_queue() and use it for scheduler, task, and database backup jobs so cloud runs on crons while self-hosted stays on high.

bootstrap/helpers/shared.php

@@ -608,6 +608,23 @@ function deployment_queue(): string
     return isCloud() ? 'deployments' : 'high';
 }
 
+/**
+ * Resolve the queue used for scheduled jobs — the scheduler dispatcher, scheduled tasks and
+ * scheduled database backups, whether triggered automatically or manually.
+ *
+ * On cloud these jobs run on a dedicated `crons` queue so they can be drained by an isolated
+ * Horizon worker pool; self-hosted keeps them on the shared `high` queue. Routing is decided
+ * by `isCloud()` (config-based), so the dispatching process needs no special env — only the
+ * worker must be configured to drain `crons`.
+ *
+ * IMPORTANT: on cloud a worker MUST include `crons` in its `HORIZON_QUEUES`, otherwise these
+ * jobs are never processed.
+ */
+function crons_queue(): string
+{
+    return isCloud() ? 'crons' : 'high';
+}
+
 function translate_cron_expression($expression_to_validate): string
 {
     if (isset(VALID_CRON_STRINGS[$expression_to_validate])) {