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/instruments/stocks/application/stock-income.service.ts

@@ -6,7 +6,7 @@ import {
   multiply,
 } from '#src/common/decimal';
 import { ISO_DATE_LENGTH, ISO_DATE_START } from '#src/common/time';
-import { decimal } from '#src/integrations/tbank/decimal';
+import { rubMoney } from '#src/integrations/tbank/decimal';
 import {
   TbankAccessService,
   type TbankDividend,
@@ -131,11 +131,7 @@ export function stockDividends(
       const recordDate = timestamp(event.recordDate)?.slice(ISO_DATE_START, ISO_DATE_LENGTH) ?? null;
       const paymentDate = timestamp(event.paymentDate)?.slice(ISO_DATE_START, ISO_DATE_LENGTH) ?? null;
       const lastBuyDate = timestamp(event.lastBuyDate)?.slice(ISO_DATE_START, ISO_DATE_LENGTH) ?? null;
-      const currency = event.dividendNet?.currency?.toUpperCase();
-      const perShare =
-        currency && event.dividendNet
-          ? { currency, value: formatDecimal(decimal(event.dividendNet)) }
-          : null;
+      const perShare = rubMoney(event.dividendNet);
       // A future payment can have an already-fixed register: keep the event, but do not estimate entitlement from today's holding.
       const eventDate = paymentDate ?? recordDate;
       const timing: StockDividendDto['timing'] = eventDate
@@ -150,7 +146,7 @@ export function stockDividends(
         recordDate >= today &&
         timing === 'upcoming'
           ? {
-              currency: perShare.currency,
+              currency: 'RUB',
               value: formatDecimal(
                 multiply(quantity, decimalFromString(perShare.value)),
               ),