feat: Enhance insurance billing system to support supplementary insurance

- Updated CoverageRule and related entities to include franchise_percent instead of franchise_rials.
- Modified Appointment entity to carry supplementary insurance ID alongside base insurance.
- Implemented SessionBillingService to ensure finalized invoices for insured patient sessions.
- Created InvoiceFinalized event to trigger claims creation upon invoice finalization.
- Added BackfillMissingClaimsCommand to generate claims for finalized invoices without existing claims.
- Developed tests to validate the new functionality for supplementary insurance handling in appointments and claims.

src/Appointment/Controller/AppointmentController.php

@@ -1059,6 +1059,7 @@ class AppointmentController extends BaseController
                 // تفکیک بیمه — مودالِ قطعی‌کردن همان مبلغی را نشان می‌دهد که ثبت شده.
                 'insurance_service_category' => $session->getInsuranceServiceCategory()?->value,
                 'insurance_base_id'          => $session->getInsuranceBaseId(),
+                'insurance_supplementary_id' => $session->getInsuranceSupplementaryId(),
                 'gross_total_rials'          => $session->getGrossTotalRials(),
                 'base_insurance_rials'       => $session->getBaseInsuranceRials(),
                 'supplementary_insurance_rials' => $session->getSupplementaryInsuranceRials(),