refactor(pricing): make the service the only price source

Price lists, annual tariffs and per-branch price overrides each answered
"what does this service cost?" differently, so a single date could carry
several answers and nobody could say which one was right. Price now lives
only on ServiceItem.price_rials, edited from the services page.

- drop PriceList/PriceListItem, their repositories and the seven
  /api/v1/price-list(s) endpoints; PricingController keeps only quote and
  the appointment price snapshot
- drop Tariff, TariffRepository, TariffService and the two
  /service-items/{uuid}/tariffs endpoints; creating or repricing a service
  no longer upserts a current-year tariff
- drop price_rials from ServiceBranchOverride; the entity stays for its
  duration columns, which DurationCalculator and ServiceSelectionValidator
  still read
- InvoiceService reads the item price directly
- PricingEngine collapses to a single source; breakdown.sources always
  reports service_item, keeping the response contract intact
- remove the price-lists admin page, its route and settings-menu entry, the
  tariff modal and the service detail tariffs tab; useAppointmentInvoice
  moves to its own hook file

Migration drops price_lists, price_list_items, service_tariffs and the
override price column.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Billing/Service/InvoiceService.php

@@ -7,7 +7,6 @@ use App\Billing\Entity\InvoiceItem;
 use App\Billing\Event\InvoiceFinalized;
 use App\Billing\Repository\InvoiceRepository;
 use App\Billing\ValueObject\Money;
-use App\ClinicService\Service\TariffService;
 use App\Insurance\Enum\ServiceCategory;
 use App\Insurance\Repository\InsuranceRepository;
 use App\Insurance\Service\TenantInsuranceService;
@@ -19,7 +18,6 @@ class InvoiceService
 {
     public function __construct(
         private readonly InvoiceRepository        $invoiceRepo,
-        private readonly TariffService            $tariffService,
         private readonly TenantInsuranceService   $tenantInsuranceService,
         private readonly BillingCalculator        $calculator,
         private readonly PatientSessionRepository $sessionRepo,
@@ -41,7 +39,7 @@ class InvoiceService
 
     /**
      * ساخت Invoice از یک Encounter (PatientSession).
-     * تعرفه‌ی هر خدمت از Tariff سال جاری (با fallback)، پوشش از قرارداد بیمه‌ی tenant.
+     * قیمت هر خدمت از خودِ سرویس، پوشش از قرارداد بیمه‌ی tenant.
      * ویزیت به‌عنوان یک آیتم جداگانه با همان قانون پوشش لحاظ می‌شود.
      */
     public function createFromSession(PatientSession $session, string $entityType, int $entityId): Invoice
@@ -76,7 +74,7 @@ class InvoiceService
         foreach ($session->getServices() as $sessionService) {
             $item       = $sessionService->getServiceItem();
             $qty        = max(1, $sessionService->getQuantity());
-            $unitPrice  = $this->tariffService->resolvePrice($item);
+            $unitPrice  = $item->getPriceRials();
             $total      = new Money($unitPrice * $qty);
 
             $baseRule = $this->tenantInsuranceService->coverageRuleForService($entityType, $entityId, $baseId, $item->getId());