add back previously removed imports

src/lerobot/configs/default.py

@@ -16,6 +16,9 @@
 
 from dataclasses import dataclass, field
 
+from lerobot import (
+    policies,  # noqa: F401
+)
 from lerobot.datasets.transforms import ImageTransformsConfig
 from lerobot.datasets.video_utils import get_safe_default_codec
 

src/lerobot/scripts/server/helpers.py

@@ -26,6 +26,14 @@ from lerobot.constants import OBS_IMAGES, OBS_STATE
 from lerobot.datasets.utils import build_dataset_frame, hw_to_dataset_features
 
 # NOTE: Configs need to be loaded for the client to be able to instantiate the policy config
+from lerobot.policies import (  # noqa: F401
+    ACTConfig,
+    DiffusionConfig,
+    PI0Config,
+    PI05Config,
+    SmolVLAConfig,
+    VQBeTConfig,
+)
 from lerobot.robots.robot import Robot
 from lerobot.utils.utils import init_logging