feat: aggregate portfolio data across accounts

Add authenticated all-account portfolio, operations, income and event endpoints. Preserve source accounts, exact currency totals and scoped cursor pagination.

src/tbank/brokerage-operation.dto.ts

@@ -12,6 +12,7 @@ import {
   Min,
 } from 'class-validator';
 import { MoneyDto } from './portfolio.dto';
+import { AccountReferenceDto } from './account-reference.dto';
 
 export const operationCategories = [
   'trade',
@@ -59,6 +60,9 @@ export class BrokerageOperationsQueryDto {
 }
 
 export class BrokerageOperationDto {
+  @ApiPropertyOptional({ type: AccountReferenceDto })
+  account?: AccountReferenceDto;
+
   @ApiProperty()
   id: string;