refactor: organize backend by business responsibility

src/integrations/tbank/tbank.api.ts

@@ -0,0 +1,23 @@
+// Public cross-module surface. Nest providers are exported by the matching module.
+export { InstrumentMetadataService } from './instrument-metadata.service';
+export {
+  TbankAccessService,
+  type TbankConnectionContext,
+} from './tbank-access.service';
+export {
+  type TbankBond,
+  type TbankCandle,
+  type TbankFundamentals,
+  type TbankShare,
+} from './tbank-market.types';
+export { TbankTokenService } from './tbank-token.service';
+export {
+  TbankClient,
+  type TbankDividend,
+  type TbankInstrument,
+  type TbankMoney,
+  type TbankOperationItem,
+  type TbankPortfolio,
+  type TbankPositions,
+  type TbankTimestamp,
+} from './tbank.client';