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/bonds/application/bond-income.service.ts

@@ -178,7 +178,7 @@ export function bondCoupons(
           recordDate &&
           recordDate >= today
             ? {
-                currency: perBond.currency,
+                currency: 'RUB',
                 value: formatDecimal(
                   multiply(quantity, decimalFromString(perBond.value)),
                 ),
@@ -227,7 +227,6 @@ export function bondMetrics(
     coupon &&
     couponPeriodDays &&
     clean &&
-    coupon.currency === clean.currency &&
     decimalFromString(coupon.value).value >= ZERO_AMOUNT &&
     decimalFromString(clean.value).value > ZERO_AMOUNT
       ? formatDecimal(