Refactor code structure for improved readability and maintainability

Co-authored-by: Copilot <copilot@github.com>

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

@@ -4,7 +4,7 @@
   Logger,
   ServiceUnavailableException,
 } from '@nestjs/common';
-import * as pdfParse from 'pdf-parse';
+import pdfParse from 'pdf-parse';
 
 const MISTRAL_API_URL = 'https://api.mistral.ai/v1/chat/completions';
 const RECEIPT_VISION_MODEL = 'mistral-small-2603';   // vision — används för bild-input
@@ -186,6 +186,7 @@ function isIgnoredReceiptLine(value: string): boolean {
   if (/^totalt\b/.test(normalized)) return true;
   if (/^kort\b/.test(normalized)) return true;
   if (/^kontant\b/.test(normalized)) return true;
+  if (/^willys\s+plus\s*[:\-]?\b/.test(normalized)) return true;
 
   return false;
 }