feat: Implement financial engine for commission and tax calculations

- Added new configuration keys for appointment and upgrade commissions, tax settings, and SMS panel fee in SiteConfigController and SiteConfigRepository.
- Introduced CommissionService to handle commission calculations for appointments and subscriptions, including tax deductions and SMS fees.
- Created FinancialBreakdown entity and repository to log financial transactions.
- Updated PaymentController to process commissions upon successful payments for appointments and subscriptions.
- Developed FinancialReportPage in the admin panel to display financial breakdowns and summaries.
- Added database migration for the new financial_breakdowns table.

src/Settlement/Repository/FinancialBreakdownRepository.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Settlement\Repository;
+
+use App\Payment\Entity\Payment;
+use App\Settlement\Entity\FinancialBreakdown;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class FinancialBreakdownRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, FinancialBreakdown::class);
+    }
+
+    public function existsForPayment(Payment $payment): bool
+    {
+        return $this->count(['payment' => $payment]) > 0;
+    }
+
+    public function save(FinancialBreakdown $entity, bool $flush = true): void
+    {
+        $this->getEntityManager()->persist($entity);
+        if ($flush) $this->getEntityManager()->flush();
+    }
+}