Revert "feat(server): deprecated the subscription module."

This reverts commit 3b79ac66ae.

packages/server/src/loaders/systemRepositories.ts

@@ -1,6 +1,7 @@
 import Container from 'typedi';
 import {
   SystemUserRepository,
+  SubscriptionRepository,
   TenantRepository,
 } from '@/system/repositories';
 
@@ -10,6 +11,7 @@ export default () => {
 
   return {
     systemUserRepository: new SystemUserRepository(knex, cache),
+    subscriptionRepository: new SubscriptionRepository(knex, cache),
     tenantRepository: new TenantRepository(knex, cache),
   };
 }