chore: strengthen backend eslint profile

src/modules/investments/brokerage-accounts/brokerage-account.dto.ts

@@ -1,6 +1,7 @@
-import { InvestmentResourceMetaDto } from '../investment-resource.dto';
 import { ApiProperty } from '@nestjs/swagger';
+
 import { MoneyDto } from '../../../common/money.dto';
+import { InvestmentResourceMetaDto } from '../investment-resource.dto';
 
 export class PortfolioSummaryDto {
   @ApiProperty({ type: MoneyDto, isArray: true })
@@ -40,15 +41,18 @@ export class BrokerageAccountDto {
     'BROKERAGE' | 'INDIVIDUAL_INVESTMENT' | 'INVEST_BOX' | 'MONEY_MARKET_FUND';
 
   @ApiProperty({ type: String, nullable: true, format: 'date' })
-  declare openedOn: string | null;
+  declare openedOn: null | string;
 
+  // eslint-disable-next-line @darraghor/nestjs-typed/api-property-matches-property-optionality -- Preserve the published required nullable schema; partial internal models may omit the field.
   @ApiProperty({ type: PortfolioSummaryDto, nullable: true })
-  portfolioSummary?: PortfolioSummaryDto | null;
+  portfolioSummary?: null | PortfolioSummaryDto;
 }
 
 export class BrokerageAccountsResourceDto {
+  // eslint-disable-next-line @darraghor/nestjs-typed/api-property-returning-array-should-set-array -- Nullable array union requires isArray in the explicit wire schema.
   @ApiProperty({ type: BrokerageAccountDto, isArray: true, nullable: true })
   declare data: BrokerageAccountDto[] | null;
+
   @ApiProperty({ type: InvestmentResourceMetaDto })
   declare meta: InvestmentResourceMetaDto;
 }