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/ClinicService/Repository/ServiceItemRepository.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\ClinicService\Repository;
+
+use App\ClinicService\Entity\ServiceItem;
+use App\ClinicService\Entity\ServiceSection;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class ServiceItemRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, ServiceItem::class);
+    }
+
+    public function findByUuid(string $uuid): ?ServiceItem
+    {
+        return $this->findOneBy(['uuid' => $uuid]);
+    }
+
+    public function findBySection(ServiceSection $section): array
+    {
+        return $this->createQueryBuilder('i')
+            ->where('i.section = :section')
+            ->setParameter('section', $section)
+            ->orderBy('i.name', 'ASC')
+            ->getQuery()
+            ->getResult();
+    }
+
+    public function save(ServiceItem $item): void
+    {
+        $this->getEntityManager()->persist($item);
+        $this->getEntityManager()->flush();
+    }
+
+    public function remove(ServiceItem $item): void
+    {
+        $this->getEntityManager()->remove($item);
+        $this->getEntityManager()->flush();
+    }
+}