fix(auth): list every route key on the class-level guard

Nest runs class and method guards together, so a class gate naming only
the view key silently required view AND action. Staff granted just an
action were denied before their key was checked. Each class gate now
names every key its routes use, and FleetView accepts an array so the
fleet controllers keep their coarse fallback.

Drops the one-off grant mapping SQL with it: already applied to dev, and
this fix removes the companion-view rule that was its recurring part.

apps/edr-freight-api/src/modules/billing/billing.controller.ts

@@ -20,7 +20,12 @@ import { FilterInvoiceDto } from "./dto/filter-invoice.dto";
 
 @ApiTags("billing")
 @Controller("billing")
-@BookingStaff(FREIGHT_PERMS.invoices.view)
+// Class gate lists every key its routes use: Nest runs class AND method
+// guards, so a key missing here would deny before the route's own key runs.
+@BookingStaff([
+  FREIGHT_PERMS.invoices.view,
+  FREIGHT_PERMS.invoices.export,
+])
 @ApiBearerAuth()
 export class BillingController {
   constructor(