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

Filter non-RUB data at ingest, collapse per-currency collections into single RUB Money, drop currency from TbankPortfolioValuePoint, remove NON_RUB_ACTIVITY and screener currency filter.

BREAKING CHANGE: per-currency API fields replaced with single RUB Money; stock screener currency param removed.

src/modules/investments/upcoming-events/upcoming-events.service.ts

@@ -156,7 +156,7 @@ export class UpcomingEventsService {
           accountId,
           calculatedAt: new Date().toISOString(),
           events,
-          incomeTotalsByCurrency: incomeTotals(events),
+          incomeTotal: incomeTotal(events),
         }
       : undefined;
     return this.forecasts.result({
@@ -286,22 +286,13 @@ function dateWindow(query: UpcomingEventsQueryDto) {
   return { from, to };
 }
 
-function incomeTotals(events: UpcomingEventDto[]): MoneyDto[] {
-  const totals = new Map<string, Decimal>();
+function incomeTotal(events: UpcomingEventDto[]): MoneyDto {
+  let total: Decimal = { value: 0n, scale: 0 };
   for (const event of events) {
     if (!['coupon', 'dividend'].includes(event.type) || !event.projectedAmount) {
       continue;
     }
-    const current = totals.get(event.projectedAmount.currency) ?? {
-      value: 0n,
-      scale: 0,
-    };
-    totals.set(
-      event.projectedAmount.currency,
-      add(current, decimalFromString(event.projectedAmount.value)),
-    );
+    total = add(total, decimalFromString(event.projectedAmount.value));
   }
-  return [...totals]
-    .sort(([left], [right]) => left.localeCompare(right))
-    .map(([currency, value]) => ({ currency, value: formatDecimal(value) }));
+  return { currency: 'RUB', value: formatDecimal(total) };
 }