Fix stale run_blocking call sites in log preview and config services

backend/app/services/jail_config_service.py

@@ -503,8 +503,7 @@ async def list_inactive_jails(
         inactive jails.
     """
     loop = asyncio.get_event_loop()
-    parsed_result: tuple[dict[str, dict[str, str]], dict[str, str]] = await run_blocking(
-        None, _parse_jails_sync, Path(config_dir)
+    parsed_result: tuple[dict[str, dict[str, str]], dict[str, str]] = await run_blocking(_parse_jails_sync, Path(config_dir)
     )
     all_jails, source_files = parsed_result
     active_names: set[str] = await _get_active_jail_names(socket_path)
@@ -601,8 +600,7 @@ async def _activate_jail(
     # ---------------------------------------------------------------------- #
     # Pre-activation validation — collect warnings but do not block           #
     # ---------------------------------------------------------------------- #
-    validation_result: JailValidationResult = await run_blocking(
-        None, _validate_jail_config_sync, Path(config_dir), name
+    validation_result: JailValidationResult = await run_blocking(_validate_jail_config_sync, Path(config_dir), name
     )
     warnings: list[str] = [f"{i.field}: {i.message}" for i in validation_result.issues]
     if warnings:
@@ -641,14 +639,10 @@ async def _activate_jail(
     # we can restore it if activation fails.                                   #
     # ---------------------------------------------------------------------- #
     local_path = Path(config_dir) / "jail.d" / f"{name}.local"
-    original_content: bytes | None = await run_blocking(
-        None,
-        lambda: local_path.read_bytes() if local_path.exists() else None,
+    original_content: bytes | None = await run_blocking(lambda: local_path.read_bytes() if local_path.exists() else None,
     )
 
-    await run_blocking(
-        None,
-        _write_local_override_sync,
+    await run_blocking(_write_local_override_sync,
         Path(config_dir),
         name,
         True,
@@ -876,9 +870,7 @@ async def _deactivate_jail(
     if name not in active_names:
         raise JailAlreadyInactiveError(name)
 
-    await run_blocking(
-        None,
-        _write_local_override_sync,
+    await run_blocking(_write_local_override_sync,
         Path(config_dir),
         name,
         False,
@@ -965,9 +957,7 @@ async def validate_jail_config(
     """
     _safe_jail_name(name)
     loop = asyncio.get_event_loop()
-    return await run_blocking(
-        None,
-        _validate_jail_config_sync,
+    return await run_blocking(_validate_jail_config_sync,
         Path(config_dir),
         name,
     )
@@ -1021,9 +1011,7 @@ async def _rollback_jail(
     loop = asyncio.get_event_loop()
 
     # Write enabled=false — this must succeed even when fail2ban is down.
-    await run_blocking(
-        None,
-        _write_local_override_sync,
+    await run_blocking(_write_local_override_sync,
         Path(config_dir),
         name,
         False,