Standardize async offloading behind shared executor helper

backend/app/utils/config_parser.py

@@ -19,7 +19,7 @@ Provides a :class:`Fail2BanConfigParser` class that wraps Python's
   comments inside multi-line values are stripped by :meth:`split_multiline`.
 
 All methods are synchronous.  Call from async contexts via
-:func:`asyncio.get_event_loop().run_in_executor`.
+:func:`app.utils.async_utils.run_blocking`.
 """
 
 from __future__ import annotations