feat: add RF2O laser odometry package (ported from lzu_robot)

Range Flow-based 2D odometry (ICRA 2016). Provides continuous odom->base_footprint TF from /scan without wheel odometry. Refactored: core algorithm in pure C++ class, ROS coupling only in node wrapper.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

ros2/src/rf2o_laser_odometry/launch/rf2o_laser_odometry.launch.py

@@ -0,0 +1,22 @@
+from launch import LaunchDescription
+from launch_ros.actions import Node
+
+
+def generate_launch_description():
+
+    return LaunchDescription([
+
+            Node(
+                package='rf2o_laser_odometry',
+                executable='rf2o_laser_odometry_node',
+                name='rf2o_laser_odometry',   
+                parameters=[{
+                    'laser_scan_topic' : '/scan',
+                    'odom_topic' : '/odom',
+                    'publish_tf' : True,
+                    'base_frame_id' : 'base_footprint',#base_footprint
+                    'odom_frame_id' : 'odom',
+                    'init_pose_from_topic' : '',
+                    'freq' : 10.0}],
+            ),
+    ])