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>

assets/admin/pages/ServiceDetailPage.tsx

@@ -16,24 +16,10 @@ import FeatureGate from '../components/ui/FeatureGate';
 import ConfirmDialog from '../components/ui/ConfirmDialog';
 import { usePermissions } from '../hooks/usePermissions';
 import { useUrlState } from '../hooks/useUrlState';
-import ServiceTariffModal from '../components/ServiceTariffModal';
 import ServiceInsuranceModal from '../components/ServiceInsuranceModal';
 import ServiceItemFormModal from '../components/ServiceItemFormModal';
 import ServiceCategoryTab from '../components/ServiceCategoryTab';
 
-interface Tariff {
-  uuid: string;
-  year: number;
-  price_rials: number;
-  is_active: boolean;
-}
-
-interface TariffList {
-  current_year: number;
-  default_price_rials: number;
-  data: Tariff[];
-}
-
 interface TenantInsurance {
   uuid: string;
   insurance_name: string | null;
@@ -51,7 +37,6 @@ interface CoverageRow {
 
 const TABS = [
   { id: 'info',      label: 'اطلاعات سرویس' },
-  { id: 'tariffs',   label: 'تعرفه‌ها' },
   { id: 'insurance', label: 'بیمه‌ها' },
   { id: 'categories',label: 'دسته‌بندی‌ها' },
   { id: 'goods',     label: 'کالاهای مرتبط' },
@@ -164,57 +149,6 @@ function InfoTab({ item }: { item: ServiceItem }) {
   );
 }
 
-function TariffsTab({ item, onManage, canUpdate }: { item: ServiceItem; onManage: () => void; canUpdate: boolean }) {
-  const { data, isLoading } = useQuery<ApiResponse<TariffList>>({
-    queryKey: ['service-tariffs', item.uuid],
-    queryFn: () => api.get(`/api/v1/service-items/${item.uuid}/tariffs`),
-  });
-
-  const list = data?.data;
-  const tariffs = list?.data ?? [];
-
-  return (
-    <div className="card card-pad">
-      <div className="card-title-row">
-        <div>
-          <b style={{ fontSize: 14 }}>تعرفه‌های سالانه</b>
-          <div className="muted" style={{ fontSize: 12 }}>
-            قیمت هر سال شمسی؛ قیمت سال جاری مبنای صورتحساب است.
-          </div>
-        </div>
-        {canUpdate && <button className="btn primary sm" onClick={onManage}>مدیریت تعرفه‌ها</button>}
-      </div>
-
-      {isLoading ? (
-        <div className="muted" style={{ fontSize: 13, padding: '12px 0' }}>در حال بارگذاری...</div>
-      ) : tariffs.length === 0 ? (
-        <div className="empty" style={{ padding: '28px 0' }}>
-          <BanknotesIcon style={{ width: 30, height: 30 }} />
-          <p className="muted">تعرفه‌ای ثبت نشده است</p>
-        </div>
-      ) : (
-        <div style={{ display: 'flex', flexDirection: 'column', gap: 8, marginTop: 12 }}>
-          {tariffs.map((t) => (
-            <div key={t.uuid} style={{
-              display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 10,
-              padding: '10px 12px', borderRadius: 'var(--r-sm)',
-              border: '1px solid var(--border)',
-              background: t.year === list?.current_year ? 'var(--primary-soft)' : 'var(--surface)',
-            }}>
-              <span style={{ display: 'inline-flex', alignItems: 'center', gap: 8, fontSize: 13 }}>
-                <b>{formatYear(t.year)}</b>
-                {t.year === list?.current_year && <span className="badge green" style={{ fontSize: 10 }}>سال جاری</span>}
-                {!t.is_active && <span className="badge gray" style={{ fontSize: 10 }}>غیرفعال</span>}
-              </span>
-              <b style={{ fontSize: 13.5, color: 'var(--primary)' }}>{formatRial(t.price_rials)}</b>
-            </div>
-          ))}
-        </div>
-      )}
-    </div>
-  );
-}
-
 function InsuranceTab({ item, onManage, canUpdate }: { item: ServiceItem; onManage: () => void; canUpdate: boolean }) {
   const { data: contractsData, isLoading } = useQuery<{ data: { data: TenantInsurance[] } }>({
     queryKey: ['tenant-insurances'],
@@ -460,7 +394,6 @@ function ServiceDetailPageInner() {
   const tab = (TABS.some((t) => t.id === urlState.tab) ? urlState.tab : 'info') as TabId;
   const setTab = (id: TabId) => setUrlState({ tab: id });
   const [editOpen, setEditOpen] = useState(false);
-  const [tariffOpen, setTariffOpen] = useState(false);
   const [insuranceOpen, setInsuranceOpen] = useState(false);
   const [toggleOpen, setToggleOpen] = useState(false);
 
@@ -541,7 +474,6 @@ function ServiceDetailPageInner() {
       </div>
 
       {tab === 'info'      && <InfoTab item={item} />}
-      {tab === 'tariffs'   && <TariffsTab item={item} onManage={() => setTariffOpen(true)} canUpdate={canUpdate} />}
       {tab === 'insurance' && <InsuranceTab item={item} onManage={() => setInsuranceOpen(true)} canUpdate={canUpdate} />}
       {tab === 'categories' && (
         <ServiceCategoryTab
@@ -559,7 +491,6 @@ function ServiceDetailPageInner() {
         onClose={() => setEditOpen(false)}
         onManageInsurance={() => setInsuranceOpen(true)}
       />
-      <ServiceTariffModal item={tariffOpen ? item : null} onClose={() => setTariffOpen(false)} />
       <ServiceInsuranceModal item={insuranceOpen ? item : null} onClose={() => setInsuranceOpen(false)} />
 
       <ConfirmDialog