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/Subscription/Repository/SubscriptionPlanRepository.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Subscription\Repository;
+
+use App\Subscription\Entity\SubscriptionPlan;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class SubscriptionPlanRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, SubscriptionPlan::class);
+    }
+
+    public function findByUuid(string $uuid): ?SubscriptionPlan
+    {
+        return $this->findOneBy(['uuid' => $uuid]);
+    }
+
+    public function findByName(string $name): ?SubscriptionPlan
+    {
+        return $this->findOneBy(['name' => $name, 'active' => true]);
+    }
+
+    public function findAllActive(): array
+    {
+        return $this->createQueryBuilder('p')
+            ->where('p.active = true')
+            ->orderBy('p.level', 'ASC')
+            ->getQuery()
+            ->getResult();
+    }
+
+    public function save(SubscriptionPlan $plan): void
+    {
+        $this->getEntityManager()->persist($plan);
+        $this->getEntityManager()->flush();
+    }
+}