feat(financial): CASHFLOW-FORECAST-V2 expenses forecast tab + cashflow chart fusion
- Backend: ForecastExpensesService (3 sources: pending PR, approved PR, orphan PO installments)
- Backend: 2 routes GET /forecast-expenses + /forecast-expenses/kpis
- Backend: expenseBreakdown {validated, forecast} added to cashflow forecast weeks
- Frontend: ExpensesForecastTab with 4 KPI cards, filters, sortable table
- Frontend: CashflowTab chart enhanced with 4 stacked bar series (income/expense x fact/forecast)
- Frontend: KPI card "Расходы прогноз (30 дн)" on Календарь ДДС
- Frontend: Chart.js legend enabled, tooltip shows expense breakdown
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
louis
8d3fca9885