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/components/layout/settingsMenu.ts

@@ -37,7 +37,6 @@ export const SETTINGS_MENU: SettingsMenuItem[] = [
   { key: 'resources',    label: 'منابع',              icon: CubeIcon,                 to: '/admin/resources',            roles: ['doctor', 'clinic'], perm: ['appointment_settings', 'view'] },
   { key: 'service-categories', label: 'دسته‌بندی‌ها',  icon: RectangleStackIcon,       to: '/admin/service-categories',   roles: ['doctor', 'clinic'], perm: ['appointment_settings', 'view'] },
   { key: 'holidays',     label: 'تعطیلات رسمی',       icon: CalendarDaysIcon,         to: '/admin/holidays',             roles: ['doctor', 'clinic'], perm: ['appointment_settings', 'view'] },
-  { key: 'price-lists',  label: 'لیست‌های قیمت',      icon: BanknotesIcon,            to: '/admin/price-lists',          roles: ['doctor', 'clinic'], perm: ['appointment_settings', 'view'] },
   { key: 'payment',      label: 'مدیریت پرداخت',      icon: BanknotesIcon,            to: '/admin/my-financial',         perm: ['payments', 'view'] },
   { key: 'secretary',    label: 'مدیریت منشی',        icon: UsersIcon,                to: '/admin/my-secretaries' },
   { key: 'staff',        label: 'پرسنل',              icon: UserPlusIcon,             to: '/admin/staff',                perm: ['staff', 'view'] },