fix: Preisanzeige für Mindestmengen in Haupttabelle (v4.3)

Problem:
- Haupttabelle zeigte nur Stückpreise statt Preise für Mindestmenge
- Kupferzuschlag (75,50€ für 100m) wurde mit Stückpreis (0,86€) addiert
- Vergleich war falsch: 0,86€ + 75,50€ = 76,36€ (unsinnig!)

Lösung:
1. Beide Preise werden für Mindestmenge angezeigt:
   - Dolibarr: 0,86€ × 100 + 75,50€ = 161,50€/100
   - Datanorm: 46,66€ + 75,50€ = 122,16€/100
2. Stückpreis als sekundäre Info in Klammern
3. Kupferzuschlag wird korrekt für Mindestmenge berechnet

Beispiel NYM-J 3x1,5:
- Dolibarr: 52,00€/100 + 45,30€ = 97,30€/100 (0,97€/m)
- Datanorm: 18,20€/100 + 45,30€ = 63,50€/100 (0,64€/m)
- Differenz: -34,7% statt -65%

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

import.php

@@ -1882,8 +1882,9 @@ if ($action == 'previewdatanorm' && $id > 0) {
                 // Load existing product's copper surcharge for price comparison
                 $productCopperSurcharge = 0;
                 $currentSupplierPriceId = 0;
+                $currentSupplierMinQty = 1;
                 if ($existingProductId > 0) {
-                    $sqlExisting = "SELECT pf.rowid, pf.fk_soc, pf.unitprice FROM ".MAIN_DB_PREFIX."product_fournisseur_price pf";
+                    $sqlExisting = "SELECT pf.rowid, pf.fk_soc, pf.unitprice, pf.quantity FROM ".MAIN_DB_PREFIX."product_fournisseur_price pf";
                     $sqlExisting .= " WHERE pf.fk_product = ".(int)$existingProductId;
                     $resExisting = $db->query($sqlExisting);
                     if ($resExisting) {
@@ -1893,6 +1894,7 @@ if ($action == 'previewdatanorm' && $id > 0) {
                             if ($objEx->fk_soc == $import->fk_soc) {
                                 $currentDolibarrPrice = (float)$objEx->unitprice;
                                 $currentSupplierPriceId = $objEx->rowid;
+                                $currentSupplierMinQty = max(1, $objEx->quantity);
                             }
                         }
                     }
@@ -1966,10 +1968,11 @@ if ($action == 'previewdatanorm' && $id > 0) {
                     'datanorm_price' => $datanorm->price,
                     'datanorm_price_unit' => $datanorm->price_unit,
                     'datanorm_ean' => $datanorm->ean,
-                    'purchase_price' => $currentDolibarrPrice, // Current Dolibarr price for comparison
+                    'purchase_price' => $currentDolibarrPrice, // Current Dolibarr unit price
-                    'datanorm_purchase_price' => $purchasePrice, // New Datanorm price
+                    'purchase_min_qty' => $currentSupplierMinQty, // Dolibarr minimum quantity
+                    'datanorm_purchase_price' => $purchasePrice, // New Datanorm unit price
                     'selling_price' => $sellingPrice,
-                    'copper_surcharge' => $copperSurchargeForPrice,
+                    'copper_surcharge' => $copperSurchargeForPrice, // Copper surcharge (for price_unit)
                     'existing_product_id' => $existingProductId,
                     'action' => $productAction,
                     'new_ref' => 'NEW-'.$supplierPrefix.'-'.$datanorm->article_number,
@@ -3020,22 +3023,56 @@ if ($action == 'edit' && $import->id > 0) {
             }
             print '</td>';
 
-            // Invoice price (from ZUGFeRD)
+            // Current Dolibarr price for minimum quantity
             print '<td class="right nowraponall">';
-            print '<strong>'.price($match['line_unit_price']).'</strong>';
+            if (!empty($match['purchase_price']) && $match['purchase_price'] > 0) {
+                $dolibarrMinQty = !empty($match['purchase_min_qty']) ? $match['purchase_min_qty'] : 1;
+                $dolibarrTotalForQty = $match['purchase_price'] * $dolibarrMinQty;
+
+                // Load copper surcharge for this supplier price
+                $dolibarrCopper = !empty($productCopperSurcharge) ? $productCopperSurcharge : 0;
+                if ($dolibarrCopper > 0) {
+                    print '<span class="small" style="color: #666;">'.price($dolibarrTotalForQty).' + '.price($dolibarrCopper).' Cu</span><br>';
+                    $dolibarrTotalForQty += $dolibarrCopper;
+                }
+
+                print '<strong>'.price($dolibarrTotalForQty);
+                if ($dolibarrMinQty > 1) {
+                    print '/'.$dolibarrMinQty;
+                }
+                print '</strong>';
+
+                // Unit price as secondary info
+                if ($dolibarrMinQty > 1) {
+                    print '<br><span class="small opacitymedium">('.price($match['purchase_price']).'/Stk.)</span>';
+                }
+            } else {
+                print '<span class="opacitymedium">-</span>';
+            }
             print '</td>';
 
-            // Datanorm price - show original price and calculated unit price
+            // Datanorm price - show price for minimum quantity
             print '<td class="right nowraponall">';
-            if ($match['datanorm_price_unit'] > 1) {
+            $datanormPriceUnit = max(1, $match['datanorm_price_unit']);
-                // Show original price and price unit
+            $datanormTotalForUnit = $match['datanorm_price'] + ($match['copper_surcharge'] * $datanormPriceUnit);
-                print '<span class="small" style="color: #666;">'.price($match['datanorm_price']).'/'.$match['datanorm_price_unit'].'</span>';
+
-                print '<br><strong>= '.price($match['purchase_price']).'</strong>';
+            // Show breakdown if copper surcharge exists
-            } else {
-                print '<strong>'.price($match['purchase_price']).'</strong>';
-            }
             if ($match['copper_surcharge'] > 0) {
-                print '<br><span class="small" style="color: #d9534f;">+ '.price($match['copper_surcharge']).' Cu</span>';
+                $copperForUnit = $match['copper_surcharge'] * $datanormPriceUnit;
+                print '<span class="small" style="color: #666;">'.price($match['datanorm_price']).' + '.price($copperForUnit).' Cu</span><br>';
+            }
+
+            // Main price for minimum quantity
+            print '<strong>'.price($datanormTotalForUnit);
+            if ($datanormPriceUnit > 1) {
+                print '/'.$datanormPriceUnit;
+            }
+            print '</strong>';
+
+            // Unit price as secondary info
+            if ($datanormPriceUnit > 1) {
+                $datanormUnitPrice = $datanormTotalForUnit / $datanormPriceUnit;
+                print '<br><span class="small opacitymedium">('.price($datanormUnitPrice).'/Stk.)</span>';
             }
             print '</td>';