chore(receipt-import): include quantity and package details in decision trace

backend/src/receipt-import/receipt-import.service.ts

@@ -60,6 +60,45 @@ function hasPorkLikeSignal(normalized: string): boolean {
   );
 }
 
+function inferPackageDebugFromRawName(rawName: string): {
+  packageCount: number;
+  packQuantity: number | null;
+  packUnit: string | null;
+} {
+  const normalized = rawName.toLowerCase();
+
+  // e.g. "3x120g", "2 x 1.5l"
+  const multiPack = /(\d+)\s*[x×]\s*(\d+(?:[\.,]\d+)?)\s*(ml|cl|dl|l|g|kg)\b/i.exec(normalized);
+  if (multiPack) {
+    const count = Number.parseInt(multiPack[1], 10);
+    const qty = Number.parseFloat(multiPack[2].replace(',', '.'));
+    const unit = multiPack[3].toLowerCase();
+    return {
+      packageCount: Number.isFinite(count) && count > 0 ? count : 1,
+      packQuantity: Number.isFinite(qty) ? qty : null,
+      packUnit: unit,
+    };
+  }
+
+  // e.g. "5dl", "1,5l"
+  const singlePack = /(\d+(?:[\.,]\d+)?)\s*(ml|cl|dl|l|g|kg)\b/i.exec(normalized);
+  if (singlePack) {
+    const qty = Number.parseFloat(singlePack[1].replace(',', '.'));
+    const unit = singlePack[2].toLowerCase();
+    return {
+      packageCount: 1,
+      packQuantity: Number.isFinite(qty) ? qty : null,
+      packUnit: unit,
+    };
+  }
+
+  return {
+    packageCount: 1,
+    packQuantity: null,
+    packUnit: null,
+  };
+}
+
 @Injectable()
 export class ReceiptImportService {
   private readonly logger = new Logger(ReceiptImportService.name);
@@ -281,7 +320,11 @@ export class ReceiptImportService {
           if (traceEnabled) trace.push(msg);
         };
 
-        pushTrace(`start raw="${item.rawName}" signal="${signalText || item.rawName}"`);
+        const pkg = inferPackageDebugFromRawName(item.rawName);
+
+        pushTrace(
+          `start raw="${item.rawName}" signal="${signalText || item.rawName}" parsedQuantity=${item.quantity ?? 'null'} parsedUnit=${item.unit ?? 'null'} packageCount=${pkg.packageCount} packQuantity=${pkg.packQuantity ?? 'null'} packUnit=${pkg.packUnit ?? 'null'}`,
+        );
         pushTrace(
           `match matchedProductId=${item.matchedProductId ?? 'null'} suggestedProductId=${item.suggestedProductId ?? 'null'}`,
         );