refactor!: support RUB only (WealthLedger/main#55) (#204)

BREAKING CHANGE: per-currency API fields replaced with single RUB Money.

src/modules/investments/portfolio/application/portfolio.service.ts

@@ -25,7 +25,7 @@ import {
   TbankSyncRepository,
 } from '../../tbank-sync/tbank-sync.api';
 import { portfolioStructure } from '../domain/portfolio-structure';
-import { sumMoneyByCurrency } from '../domain/portfolio-totals';
+import { sumMoney } from '../domain/portfolio-totals';
 import {
   portfolioFreshForMs,
   PortfolioRepository,
@@ -184,16 +184,16 @@ export class PortfolioService {
             isStale: portfolios.length
               ? portfolios.some((portfolio) => portfolio.isStale)
               : saved.membership.freshness !== 'fresh',
-            totalsByCurrency: sumMoneyByCurrency(
-              portfolios.flatMap((portfolio) => portfolio.totalsByCurrency),
+            totals: sumMoney(
+              portfolios.map((portfolio) => portfolio.totals),
             ),
-            cashBalances: sumMoneyByCurrency(
-              portfolios.flatMap((portfolio) => portfolio.cashBalances),
+            cash: sumMoney(
+              portfolios.map((portfolio) => portfolio.cash),
             ),
             positions: portfolios.flatMap((portfolio) => portfolio.positions),
             structure: portfolioStructure(
               portfolios.flatMap((portfolio) => portfolio.positions),
-              portfolios.flatMap((portfolio) => portfolio.cashBalances),
+              portfolios.map((portfolio) => portfolio.cash),
             ),
           };
     const work =