Fix Docker image name and remove obsolete version field

- Change image from osrf/ros:humble-ros-base to ros:humble-ros-base
- Remove obsolete 'version' field from docker-compose.yml

The official ROS Docker images are at ros:*, not osrf/ros:*.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: yconst

docker-compose.yml

@@ -1,8 +1,6 @@
-version: '3.8'
-
 services:
   ros2:
-    image: osrf/ros:humble-ros-base
+    image: ros:humble-ros-base
     container_name: tinymovr_ros2
     privileged: true
     network_mode: host