feat: enhance JWT authentication and quick import functionality with logging for better traceability

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

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

@@ -76,6 +76,8 @@ export class QuickImportService {
    * Importerar från en uppladdad fil
    */
   async importFromUpload(file: Express.Multer.File): Promise<QuickImportResult | ReceiptImportResult> {
+    this.logger.log('MIME-typ:', file.mimetype);
+    this.logger.log('Token:', file.originalname);
     const kind = file.mimetype.startsWith('image/') ? 'image' : 'pdf';
     return this.importFromBuffer(file.buffer, kind);
   }