fix: import sys manquant — crash 'name sys is not defined' en mode frozen

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

anonymizer_core_refactored_onnx.py

@@ -17,6 +17,7 @@ import json
 import logging
 import os
 import re
+import sys
 from concurrent.futures import ProcessPoolExecutor
 
 log = logging.getLogger(__name__)