feat(async): register unitree_g1 and zmq camera in robot_client

Async inference against the G1 failed at config parsing: draccus had no
choice class for robot type 'unitree_g1' or camera type 'zmq' because
neither module was imported for registration. Also guard the realsense
import, since pyrealsense2 isn't importable on every platform (e.g. Jetson
with an older glibc) and shouldn't crash the client when it goes unused.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lerobot/async_inference/robot_client.py

@@ -48,7 +48,15 @@ import grpc
 import torch
 
 from lerobot.cameras.opencv import OpenCVCameraConfig  # noqa: F401
-from lerobot.cameras.realsense import RealSenseCameraConfig  # noqa: F401
+from lerobot.cameras.zmq.configuration_zmq import ZMQCameraConfig  # noqa: F401
+
+# pyrealsense2 isn't importable on every platform (e.g. Jetson with an older glibc). Register
+# the realsense camera type when it's available, but don't hard-crash the client when it isn't.
+try:
+    from lerobot.cameras.realsense import RealSenseCameraConfig  # noqa: F401
+except ImportError:
+    RealSenseCameraConfig = None
+
 from lerobot.robots import (  # noqa: F401
     Robot,
     RobotConfig,
@@ -57,6 +65,7 @@ from lerobot.robots import (  # noqa: F401
     make_robot_from_config,
     omx_follower,
     so_follower,
+    unitree_g1,
 )
 from lerobot.transport import (
     services_pb2,  # type: ignore