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/Staff/Repository/ClinicStaffRepository.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Staff\Repository;
+
+use App\Staff\Entity\ClinicStaff;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class ClinicStaffRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, ClinicStaff::class);
+    }
+
+    public function findByUuid(string $uuid): ?ClinicStaff
+    {
+        return $this->findOneBy(['uuid' => $uuid]);
+    }
+
+    public function findByEntity(string $entityType, int $entityId, bool $activeOnly = false): array
+    {
+        $qb = $this->createQueryBuilder('s')
+            ->where('s.entityType = :type')
+            ->andWhere('s.entityId = :id')
+            ->setParameter('type', $entityType)
+            ->setParameter('id', $entityId)
+            ->orderBy('s.fullName', 'ASC');
+
+        if ($activeOnly) {
+            $qb->andWhere('s.active = true');
+        }
+
+        return $qb->getQuery()->getResult();
+    }
+
+    public function save(ClinicStaff $staff): void
+    {
+        $this->getEntityManager()->persist($staff);
+        $this->getEntityManager()->flush();
+    }
+}