Refactor app helpers and use AppStateDep in config router

Move service-dependent helper wrappers from app.utils to app.helpers and update config router activation/rollback to use explicit AppState dependency.

backend/app/services/action_config_service.py

@@ -17,6 +17,12 @@ from pathlib import Path
 
 import structlog
 
+from app.exceptions import ConfigWriteError, JailNotFoundInConfigError
+from app.helpers.config_file_helpers import (
+    _get_active_jail_names,
+    _parse_jails_sync,
+)
+from app.helpers.jail_helpers import reload_jails
 from app.models.config import (
     ActionConfig,
     ActionConfigUpdate,
@@ -25,14 +31,7 @@ from app.models.config import (
     ActionUpdateRequest,
     AssignActionRequest,
 )
-from app.exceptions import JailNotFoundError
-from app.utils.config_file_utils import (
-    _parse_jails_sync,
-    _get_active_jail_names,
-)
-from app.exceptions import ConfigWriteError, JailNotFoundInConfigError
 from app.utils import conffile_parser
-from app.utils.jail_utils import reload_jails
 
 log: structlog.stdlib.BoundLogger = structlog.get_logger()