fix(db): purge service-item config rows on delete (M20)

Tariff and TenantServiceCoverage reference a service item by a raw int (no FK),
so deleting an item orphaned its tariffs and tenant-coverage config. Delete them
in deleteItem() before removing the item. (The in-use FK guard for invoice/claim
usage is preserved.)

Remaining M20 refs (ClinicStaff/SmsWallet/DoctorAddress.clinicId/Claim.insurance_id
on rare owner deletions) are accepted as harmless unreferenced rows; SmsWallet is
intentionally retained as a financial record. Documented in docs/audit-backlog.md.

Regression: tests/ClinicService/ServiceItemDeleteCleanupTest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ClinicService/Controller/ClinicServiceController.php

@@ -5,6 +5,9 @@ namespace App\ClinicService\Controller;
 use App\Auth\Entity\User;
 use App\ClinicService\Entity\ServiceItem;
 use App\ClinicService\Entity\ServiceSection;
+use App\Insurance\Entity\TenantServiceCoverage;
+use App\ClinicService\Entity\Tariff;
+use Doctrine\ORM\EntityManagerInterface;
 use App\ClinicService\Repository\ServiceItemRepository;
 use App\ClinicService\Repository\ServiceSectionRepository;
 use App\ClinicService\Repository\TariffRepository;
@@ -36,6 +39,7 @@ class ClinicServiceController extends BaseController
         private readonly ClinicRepository         $clinicRepo,
         private readonly TariffRepository         $tariffRepo,
         private readonly TariffService            $tariffService,
+        private readonly EntityManagerInterface   $em,
     ) {}
 
     // ── Service Sections ─────────────────────────────────────────────────────
@@ -230,6 +234,14 @@ class ClinicServiceController extends BaseController
             return $this->error(ErrorCodes::ERR_SERVICE_NOT_FOUND, ErrorCodes::message(ErrorCodes::ERR_SERVICE_NOT_FOUND), 404);
         }
 
+        // Tariff and tenant-coverage rows reference the item by a raw int (no FK),
+        // so they would orphan on delete. Remove the item's config rows first.
+        $itemId = $item->getId();
+        $this->em->createQuery('DELETE FROM ' . Tariff::class . ' t WHERE t.serviceItemId = :id')
+            ->setParameter('id', $itemId)->execute();
+        $this->em->createQuery('DELETE FROM ' . TenantServiceCoverage::class . ' c WHERE c.serviceItemId = :id')
+            ->setParameter('id', $itemId)->execute();
+
         try {
             $this->itemRepo->remove($item);
         } catch (\Doctrine\DBAL\Exception\ForeignKeyConstraintViolationException) {