Forecast cash position from bank, invoice and payment schedule APIs

## Cash-Position Forecasting Pipeline Receives a forecast request, pulls live data from banking, accounts-receivable (invoices) and payment schedules, aggregates the data, and returns a projected cash-position forecast with full audit trail. ### All nodes (1-line each) 1. Webhook - Forecast Request – Receives the cash-position forecast request via POST. 2. Code - Validate & Load Sources – Validates the request and loads data-source configuration + forecast horizon. 3. Wait - Pre Banking Pull – Short pause before banking data retrieval. 4. HTTP Request - Fetch Banking Balances – Pulls current balances and recent transactions from banking APIs. 5. Wait - Pre Invoices Pull – Pause before accounts-receivable / invoice data retrieval. 6. HTTP Request - Fetch Outstanding Invoices – Pulls open invoices and expected collection dates. 7. Wait - Pre Schedules Pull – Pause before payment-schedule data retrieval. 8. HTTP Request - Fetch Payment Schedules – Pulls upcoming AP, payroll, tax and recurring payments. 9. HTTP Request - Enrich / FX Rates – Optional FX rates or external enrichment for multi-currency positions. 10. Code - Build Cash Forecast – Aggregates banking + invoices + schedules into daily/weekly cash-position projection. 11. Respond to Webhook – Returns the complete cash-position forecast report to the caller.