fix: add missing line_total field during invoice item insertion to prevent General error 1364

app/Services/InvoiceProcessor.php

@@ -125,8 +125,8 @@ class InvoiceProcessor
                         INSERT INTO invoice_lines (
                             id, invoice_id, line_number, description, 
                             quantity, unit_price, tax_rate, tax_amount, 
-                            discount_amount, net_total, tax_category
-                        ) VALUES (?,?,?,?,?,?,?,?,?,?,?)
+                            discount_amount, net_total, line_total, tax_category
+                        ) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)
                     ");
                     foreach ($extracted['lines'] as $idx => $line) {
                         $quantity = (float)($line['quantity'] ?? 1);
@@ -148,6 +148,7 @@ class InvoiceProcessor
                             $taxAmount,
                             $discount,
                             $netTotal,
+                            $netTotal, // line_total
                             $line['tax_category'] ?? 'standard'
                         ]);
                     }