feat: implement staff management and subscription system

- Added StaffController for managing clinic staff, including listing, creating, updating, and toggling staff status.
- Created ClinicStaff entity and repository for staff data handling.
- Developed SubscriptionController to manage subscription plans and periods, including trial subscriptions.
- Introduced SubscriptionPlan, SubscriptionPeriod, and ClinicSubscription entities for subscription management.
- Implemented SubscriptionService for handling subscription logic, including trial activation and subscription creation from payments.
- Added necessary repositories for subscription entities to facilitate data access and manipulation.

src/Sms/Repository/SmsSettingsRepository.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Sms\Repository;
+
+use App\Sms\Entity\SmsSettings;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class SmsSettingsRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, SmsSettings::class);
+    }
+
+    public function findByEntity(string $entityType, int $entityId): ?SmsSettings
+    {
+        return $this->findOneBy(['entityType' => $entityType, 'entityId' => $entityId]);
+    }
+
+    public function save(SmsSettings $settings): void
+    {
+        $this->getEntityManager()->persist($settings);
+        $this->getEntityManager()->flush();
+    }
+}