feat: expose instrument isin in portfolio positions

src/tbank/portfolio.service.spec.ts

@@ -88,7 +88,7 @@ describe('PortfolioService', () => {
       ],
     });
     tbank.getInstrumentByFigi
-      .mockResolvedValueOnce({ ticker: 'ONE', name: 'Первая позиция' })
+      .mockResolvedValueOnce({ ticker: 'ONE', name: 'Первая позиция', isin: 'RU000A0JX0J2' })
       .mockRejectedValueOnce(new Error('unavailable'));
 
     await expect(service.get('user', 'account')).resolves.toMatchObject({
@@ -100,6 +100,7 @@ describe('PortfolioService', () => {
           quantity: '2',
           currentValue: { currency: 'RUB', value: '6' },
           absoluteReturn: { currency: 'RUB', value: '2' },
+          isin: 'RU000A0JX0J2',
         },
         {
           figi: 'TWO',
@@ -107,6 +108,7 @@ describe('PortfolioService', () => {
           type: 'OTHER',
           quantity: '-0.5',
           currentValue: { currency: 'USD', value: '-2' },
+          isin: null,
         },
       ],
       cashBalances: [{ currency: 'RUB', value: '1.5' }],