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/ClinicServicesPage.tsx

@@ -19,7 +19,6 @@ import { usePermissions } from '../hooks/usePermissions';
 import PageHeader from '../components/ui/PageHeader';
 import Modal from '../components/ui/Modal';
 import ConfirmDialog from '../components/ui/ConfirmDialog';
-import ServiceTariffModal from '../components/ServiceTariffModal';
 import ServiceInsuranceModal from '../components/ServiceInsuranceModal';
 import ServiceItemFormModal from '../components/ServiceItemFormModal';
 import FeatureGate from '../components/ui/FeatureGate';
@@ -55,7 +54,6 @@ function ClinicServicesPageInner() {
   const [sectionModal, setSectionModal] = useState<'create' | ServiceSection | null>(null);
   const [itemModal, setItemModal] = useState<'create' | ServiceItem | null>(null);
   const [toggleItem, setToggleItem] = useState<ServiceItem | null>(null);
-  const [tariffItem, setTariffItem] = useState<ServiceItem | null>(null);
   const [insuranceItem, setInsuranceItem] = useState<ServiceItem | null>(null);
   const [search, setSearch] = useState('');
   const [showInactive, setShowInactive] = useState(true);
@@ -282,7 +280,6 @@ function ClinicServicesPageInner() {
                         <div style={{ position: 'fixed', inset: 0, zIndex: 40 }} onClick={(e) => { e.stopPropagation(); setMenuOpen(null); }} />
                         <div onClick={(e) => e.stopPropagation()} style={{ position: 'absolute', top: 40, insetInlineStart: 8, zIndex: 41, background: 'var(--surface)', border: '1px solid var(--border)', borderRadius: 'var(--r-sm)', boxShadow: 'var(--shadow)', padding: 6, minWidth: 176, display: 'flex', flexDirection: 'column', gap: 2 }}>
                           <button style={menuItemStyle} onClick={() => { setMenuOpen(null); setItemModal(item); }}><PencilIcon style={{ width: 15 }} /> ویرایش</button>
-                          <button style={menuItemStyle} onClick={() => { setMenuOpen(null); setTariffItem(item); }}><BanknotesIcon style={{ width: 15 }} /> تعرفه‌های سالانه</button>
                           <button style={menuItemStyle} onClick={() => { setMenuOpen(null); setInsuranceItem(item); }}><ShieldCheckIcon style={{ width: 15 }} /> پوشش بیمه</button>
                           <button style={menuItemStyle} onClick={() => { setMenuOpen(null); setToggleItem(item); }}>{item.active ? <EyeSlashIcon style={{ width: 15 }} /> : <EyeIcon style={{ width: 15 }} />}{item.active ? ' غیرفعال‌کردن' : ' فعال‌کردن'}</button>
                         </div>
@@ -368,7 +365,6 @@ function ClinicServicesPageInner() {
         onClose={() => setItemModal(null)}
         onManageInsurance={setInsuranceItem}
       />
-      <ServiceTariffModal item={tariffItem} onClose={() => setTariffItem(null)} />
 
       <ServiceInsuranceModal item={insuranceItem} onClose={() => setInsuranceItem(null)} />