Add optional service pricing matrix and fix admin catalog save.

Users pick per-service CPU/memory/storage at deploy; admins manage unit rates and deploy defaults. PATCH sends only fields accepted by the pricing-catalog DTO.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/billing/billing.module.ts

@@ -5,6 +5,8 @@ import { BillingController } from './billing.controller';
 import { PricingCatalogService } from './pricing-catalog.service';
 import { PricingRate } from './entities/pricing-rate.entity';
 import { AddonRate } from './entities/addon-rate.entity';
+import { OptionalServiceProfile } from './entities/optional-service-profile.entity';
+import { OptionalServiceRate } from './entities/optional-service-rate.entity';
 import { Wallet } from './entities/wallet.entity';
 import { WalletTransaction } from './entities/wallet-transaction.entity';
 import { ResourceCredit } from './entities/resource-credit.entity';
@@ -17,6 +19,8 @@ import { KubernetesModule } from '../kubernetes/kubernetes.module';
     TypeOrmModule.forFeature([
       PricingRate,
       AddonRate,
+      OptionalServiceProfile,
+      OptionalServiceRate,
       Wallet,
       WalletTransaction,
       ResourceCredit,