Removed detailed description of the `raw` parameter in XML
documentation for two methods in `SwissQrCodeController`.
Updated `<returns>` tag to simplify the explanation by
removing conditional details based on the `raw` parameter.
These changes affect methods handling multipart/form-data
PDF input and Base64 JSON input.
- Add 'raw' query parameter to both ExtractFromFile and ExtractFromBase64 methods
- Returns raw QR text lines when raw=true, parsed Bill object when raw=false (default)
- Remove obsolete 'references' parameter (not part of QR extraction logic)
- Add XML documentation for raw parameter
- Update ExceptionHandlingMiddleware to handle BadRequestException
