feat: détection doublons par numéro+montant dans les 3 points d'import

server/routers.ts

@@ -252,11 +252,11 @@ export const appRouter = router({
                   processingProgress: `Extraction ${i + 1}/${result.invoiceCount} factures...`,
                 });
                 
-                // Check for duplicates
+                // Check for duplicates (numéro de facture + montant)
                 const duplicate = await findDuplicateInvoice(
-                  invoiceData.supplierName,
                   invoiceData.invoiceNumber,
-                  invoiceData.invoiceDate
+                  invoiceData.totalAmount?.toString() ?? null,
+                  userId
                 );
                 
                 if (duplicate) {
@@ -264,7 +264,7 @@ export const appRouter = router({
                   duplicateDetails.push({
                     supplierName: invoiceData.supplierName,
                     invoiceNumber: invoiceData.invoiceNumber,
-                    invoiceDate: invoiceData.invoiceDate,
+                    totalAmount: invoiceData.totalAmount,
                   });
                   continue;
                 }