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-screener.service.spec.ts

@@ -87,7 +87,6 @@ describe('StockScreenerService', () => {
     client.getAllShares.mockResolvedValueOnce([
       share(1, {
         countryOfRisk: undefined,
-        currency: undefined,
         isin: undefined,
         realExchange: undefined,
         sector: undefined,
@@ -96,7 +95,7 @@ describe('StockScreenerService', () => {
       }),
     ]);
     const result = await service.search('user-1', {});
-    expect(result.items[0]).toEqual(expect.objectContaining({ countryOfRisk: null, currency: null, isin: null, logoName: null, ticker: null }));
+    expect(result.items[0]).toEqual(expect.objectContaining({ countryOfRisk: null, currency: 'RUB', isin: null, logoName: null, ticker: null }));
 
     client.getAllShares.mockResolvedValueOnce([share(2, { name: ' ' })]);
     await expect(service.search('user-1', {})).rejects.toBeInstanceOf(ServiceUnavailableException);