feat: Re-compute the given items cost job.

feat: Optimize the architecture.

server/src/loaders/jobs.ts

@@ -0,0 +1,17 @@
+import Agenda from 'agenda';
+import WelcomeEmailJob from '@/Jobs/welcomeEmail';
+import ComputeItemCost from '@/Jobs/ComputeItemCost';
+
+export default ({ agenda }: { agenda: Agenda }) => {
+  agenda.define(
+    'welcome-email',
+    { priority: 'high' },
+    new WelcomeEmailJob().handler,
+  );
+  agenda.define(
+    'compute-item-cost',
+    { priority: 'high' },
+    new ComputeItemCost().handler,
+  );
+  agenda.start();
+};