feat(bookings): add ad-hoc additional-charge module

New freight.additional_charge table, independent of BookingClearanceCharge
(unbounded per booking, free-text reason). Draft -> send issues an invoice
and notifies the customer in-app/SMS/email; settles via the standard
.invoice.paid event. Adds the Additional charges row-menu entry
next to Cancel booking, permission-gated.

Not included: the Additional Payments tab UI, add-charge modal, portal pay
flow.

apps/edr-freight-api/src/modules/bookings/bookings.module.ts

@@ -38,6 +38,9 @@ import { BookingsService } from './bookings.service';
 import { BookingCargoModifier } from './entities/booking-cargo-modifier.entity';
 import { BookingDocumentReview } from './entities/booking-document-review.entity';
 import { BookingClearanceCharge } from './entities/booking-clearance-charge.entity';
+import { AdditionalCharge } from './entities/additional-charge.entity';
+import { AdditionalChargeRepository } from './additional-charge.repository';
+import { AdditionalChargeService } from './additional-charge.service';
 import { BookingClearanceChargeService } from './booking-clearance-charge.service';
 import { BookingClearanceEvent } from './entities/booking-clearance-event.entity';
 import { ClearanceEventService } from './clearance-event.service';
@@ -82,6 +85,7 @@ import { VehiclesModule } from "../vehicles/vehicles.module";
       ConsolidationApproval,
       BookingClearanceCharge,
       BookingClearanceEvent,
+      AdditionalCharge,
     ]),
     BillingModule,
     DocumentsModule,
@@ -119,6 +123,8 @@ import { VehiclesModule } from "../vehicles/vehicles.module";
     BookingInvoiceService,
     BookingClearanceChargeService,
     ClearanceEventService,
+    AdditionalChargeRepository,
+    AdditionalChargeService,
     ContractTemplateResolver,
     ContractViewModelBuilder,
     ContractPricingScheduleBuilder,