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/dto/billing.dto.ts

@@ -2,6 +2,7 @@ import { IsString, IsEnum, IsOptional, IsBoolean, IsNumber, IsArray, ValidateNes
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
 import { Type } from 'class-transformer';
 import { BillingCycle, PricingResourceType, AppRuntime } from '../../common/enums';
+import { OptionalServiceResourcesDto } from './optional-service-resources.dto';
 
 export class CreatePricingRuleDto {
   @ApiProperty({ enum: PricingResourceType })
@@ -137,6 +138,18 @@ export class CalculateCostDto {
   @IsBoolean()
   enableElasticsearch?: boolean;
 
+  @ApiPropertyOptional({ type: OptionalServiceResourcesDto })
+  @IsOptional()
+  @ValidateNested()
+  @Type(() => OptionalServiceResourcesDto)
+  redisResources?: OptionalServiceResourcesDto;
+
+  @ApiPropertyOptional({ type: OptionalServiceResourcesDto })
+  @IsOptional()
+  @ValidateNested()
+  @Type(() => OptionalServiceResourcesDto)
+  rabbitmqResources?: OptionalServiceResourcesDto;
+
   @ApiPropertyOptional({ example: false, description: 'Enable custom domain with SSL' })
   @IsOptional()
   @IsBoolean()