fix(queue): route cloud jobs to dedicated queues

Use config-based queue selection for deployment and scheduled jobs so cloud dispatches deployments to `deployments` and scheduled jobs to `crons`, while self-hosted keeps using `high`.

Add coverage for deployment queue helper, start action routing, and scheduled job manager routing.

tests/Unit/ScheduledJobManagerLockTest.php

@@ -2,6 +2,9 @@
 
 use App\Jobs\ScheduledJobManager;
 use Illuminate\Queue\Middleware\WithoutOverlapping;
+use Tests\TestCase;
+
+uses(TestCase::class);
 
 it('uses WithoutOverlapping middleware with expireAfter to prevent stale locks', function () {
     $job = new ScheduledJobManager;