feat(pricing): the server prices app orders with legacy's making-charge formula (MON-08)

Legacy: final % = variant % + customer % − the largest active promotion
on the product, its category or its brand; rial charge 0. The apps sent
the variant's own % only, so the new app undercharged by the customer's
percent (usually 3) and ignored promotions, and the server trusted
whatever the app sent.

- pricing/wage-formula.ts: one formula, legacy by default, with
  coefficients, promotion pick, constant, floor/cap and rounding so the
  admin screen can change it; validated
- an app order is priced by it; the app's wage, discount and rial charge
  are ignored; an operator's manual numbers are kept
- POST customer/me/wage-quote; both apps show that figure
- admin/pricing/wage-formula (config.wage): read, preview, approve with
  the sample it was checked on, last 20 versions kept; the setting is
  kept off the generic const routes

Owner approval: 2026-10-08.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/src/modules/orders/orders.module.ts

@@ -3,9 +3,10 @@ import { OrdersService } from './orders.service';
 import { OrdersController } from './orders.controller';
 import { CatalogModule } from '../catalog/catalog.module';
 import { AccountingModule } from '../accounting/accounting.module';
+import { PricingModule } from '../pricing/pricing.module';
 
 @Module({
-  imports: [CatalogModule, AccountingModule],
+  imports: [CatalogModule, AccountingModule, PricingModule],
   controllers: [OrdersController],
   providers: [OrdersService],
   exports: [OrdersService],