init: ROS2 learning suite

src/bringup/launch/full_demo_launch.py

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+"""
+full_demo_launch.py —— 整合所有 demo(全套启动)。
+
+启动的节点:
+    - 4 个 pub/sub 节点(pubsub)
+    - add_two_ints server(srv)
+    - fibonacci action server(action)
+    - 3 节点 URDF TF2(robot)
+    - fake_camera + image_processor(vision)
+
+总计 ~10 个节点同时运行,展示整个 ROS2 通信栈。
+"""
+
+from launch import LaunchDescription
+from launch.actions import IncludeLaunchDescription
+from launch.launch_description_sources import PythonLaunchDescriptionSource
+from launch_ros.substitutions import FindPackageShare
+from launch.substitutions import PathJoinSubstitution
+
+
+def _include(pkg_name, launch_file):
+    pkg = FindPackageShare(pkg_name)
+    path = PathJoinSubstitution([pkg, 'launch', launch_file])
+    return IncludeLaunchDescription(PythonLaunchDescriptionSource(path))
+
+
+def generate_launch_description():
+    return LaunchDescription([
+        _include('py_pubsub',    'pubsub_launch.py'),
+        _include('cpp_pubsub',   'pubsub_launch.py'),
+        _include('py_srv',       'srv_launch.py'),
+        _include('py_action_demo', 'action_launch.py'),
+        _include('cpp_robot_tf2', 'robot_tf2_launch.py'),
+        _include('py_vision_demo', 'vision_launch.py'),
+    ])