Add TTC amount configuration and display for financial tracking

Introduces `nocodbInvoiceAmountTTCColumnName` to `Groups.tsx` and `amountTTC` to `PaymentSchedule` interface in `PaymentSchedulePage.tsx` to support TTC calculations and display. Updates backend routes in `routes.ts` to include `amountTTC` and modifies `PaymentSchedulePage.tsx` to show both HT and TTC totals.

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Replit-Commit-Session-Id: 1e4433b5-47ab-464c-b663-fea2e53367dd
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server/routes.ts

@@ -445,6 +445,7 @@ export async function registerRoutes(app: Express): Promise<Server> {
           invoiceReference: delivery.invoiceReference,
           dueDate: delivery.dueDate,
           amount: delivery.invoiceAmount ? parseFloat(delivery.invoiceAmount) : 0,
+          amountTTC: delivery.invoiceAmountTTC ? parseFloat(delivery.invoiceAmountTTC) : 0,
           supplierName: supplier?.name || 'Fournisseur inconnu',
           paymentMethod: supplier?.paymentMethod || null,
           groupId: group.id,