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/ClinicService/Repository/TariffRepository.php

@@ -1,48 +0,0 @@
-<?php
-
-namespace App\ClinicService\Repository;
-
-use App\ClinicService\Entity\Tariff;
-use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
-use Doctrine\Persistence\ManagerRegistry;
-
-class TariffRepository extends ServiceEntityRepository
-{
-    public function __construct(ManagerRegistry $registry)
-    {
-        parent::__construct($registry, Tariff::class);
-    }
-
-    public function findForServiceYear(int $serviceItemId, int $year): ?Tariff
-    {
-        return $this->findOneBy([
-            'serviceItemId' => $serviceItemId,
-            'year'          => $year,
-            'isActive'      => true,
-        ]);
-    }
-
-    /** @return Tariff[] */
-    public function findByService(int $serviceItemId): array
-    {
-        return $this->createQueryBuilder('t')
-            ->where('t.serviceItemId = :sid')
-            ->setParameter('sid', $serviceItemId)
-            ->orderBy('t.year', 'DESC')
-            ->getQuery()
-            ->getResult();
-    }
-
-    public function findByUuid(string $uuid): ?Tariff
-    {
-        return $this->findOneBy(['uuid' => $uuid]);
-    }
-
-    public function save(Tariff $entity, bool $flush = true): void
-    {
-        $this->getEntityManager()->persist($entity);
-        if ($flush) {
-            $this->getEntityManager()->flush();
-        }
-    }
-}