feat(tbank): add brokerage account summaries

src/tbank/portfolio.service.ts

@@ -8,6 +8,7 @@ import {
   multiply,
   subtract,
 } from './decimal';
+import { totalsByCurrency } from './portfolio-totals';
 import { MoneyDto, PortfolioDto, PortfolioPositionDto } from './portfolio.dto';
 import { TbankAccessService } from './tbank-access.service';
 import { InstrumentMetadataService } from './instrument-metadata.service';
@@ -106,22 +107,10 @@ export class PortfolioService {
       currency,
       value: formatDecimal(value),
     }));
-    const totals = new Map(cash);
-    for (const position of positions) {
-      if (!position?.currentValue) continue;
-      const amount = decimalFromString(position.currentValue.value);
-      totals.set(
-        position.currentValue.currency,
-        add(totals.get(position.currentValue.currency) ?? decimal({}), amount),
-      );
-    }
     return {
       lastSuccessfulAt: new Date().toISOString().replace(/\.\d{3}Z$/, 'Z'),
       isStale: false,
-      totalsByCurrency: [...totals].map(([currency, value]) => ({
-        currency,
-        value: formatDecimal(value),
-      })),
+      totalsByCurrency: totalsByCurrency(upstream, money),
       positions: positions.filter(
         (position): position is PortfolioPositionDto => position !== null,
       ),