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

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

src/modules/investments/portfolio/domain/complete-valuation.ts

@@ -1,13 +1,11 @@
 type Valuation = {
   positions: { currentValue: unknown }[];
-  totalsByCurrency: unknown[];
+  totals: { value: string };
 };
 
-const MIN_TOTALS_COUNT = 0;
-
 export function isCompleteValuation(
   snapshot: Valuation,
 ): boolean {
-  return snapshot.totalsByCurrency.length > MIN_TOTALS_COUNT &&
+  return Boolean(snapshot.totals) &&
     snapshot.positions.every((position) => position.currentValue !== null);
 }