Remove obsolete function disable_logging

src/ddns_service/logging.py

@@ -129,8 +129,3 @@ def setup_logging(
     handler.addFilter(txn_filter)
     handler.setFormatter(formatter)
     root.addHandler(handler)
-
-
-def disable_logging():
-    """Disable all logging (for CLI quiet mode)."""
-    logging.disable(logging.CRITICAL)

src/ddns_service/main.py

@@ -22,7 +22,7 @@ from .cli import (
     cmd_user_passwd,
 )
 from .config import ConfigError, find_config_file, load_config
-from .logging import disable_logging, setup_logging
+from .logging import setup_logging
 from .server import run_daemon