## Problem
When we launch openarm_bringup, the following error are raised.
```console
$ ros2 launch openarm_bringup openarm.launch.py
[INFO] [launch]: All log files can be found below /home/otegami/.ros/log/2025-05-23-15-07-52-834283-otegami-2239551
[INFO] [launch]: Default logging verbosity is set to INFO
[INFO] [ros2_control_node-1]: process started with pid [2239568]
[INFO] [robot_state_publisher-2]: process started with pid [2239569]
[INFO] [rviz2-3]: process started with pid [2239570]
[robot_state_publisher-2] [INFO] [1747984073.330768599] [robot_state_publisher]: Robot initialized
[ros2_control_node-1] [INFO] [1747984073.346291338] [controller_manager]: Using Steady (Monotonic) clock for triggering controller manager cycles.
[ros2_control_node-1] [ERROR] [1747984073.346957366] [pluginlib.ClassLoader]: Could not find a root element for package manifest at /home/otegami/work/cpp/ros2_ws/install/openarm_hardware/share/openarm_hardware/package.xml.
[ros2_control_node-1] [ERROR] [1747984073.347001329] [pluginlib.ClassLoader]: Could not find package manifest (neither package.xml or deprecated manifest.xml) at same directory level as the plugin XML file /home/otegami/work/cpp/ros2_ws/install/openarm_hardware/share/openarm_hardware/openarm_hardware.xml. Plugins will likely not be exported properly.
[ros2_control_node-1] )
[ros2_control_node-1] [ERROR] [1747984073.347237704] [pluginlib.ClassLoader]: Could not find a root element for package manifest at /home/otegami/work/cpp/ros2_ws/install/openarm_hardware/share/openarm_hardware/package.xml.
[ros2_control_node-1] [ERROR] [1747984073.347246277] [pluginlib.ClassLoader]: Could not find package manifest (neither package.xml or deprecated manifest.xml) at same directory level as the plugin XML file /home/otegami/work/cpp/ros2_ws/install/openarm_hardware/share/openarm_hardware/openarm_hardware.xml. Plugins will likely not be exported properly.
[ros2_control_node-1] )
[ros2_control_node-1] [ERROR] [1747984073.347465709] [pluginlib.ClassLoader]: Could not find a root element for package manifest at /home/otegami/work/cpp/ros2_ws/install/openarm_hardware/share/openarm_hardware/package.xml.
[ros2_control_node-1] [ERROR] [1747984073.347471103] [pluginlib.ClassLoader]: Could not find package manifest (neither package.xml or deprecated manifest.xml) at same directory level as the plugin XML file /home/otegami/work/cpp/ros2_ws/install/openarm_hardware/share/openarm_hardware/openarm_hardware.xml. Plugins will likely not be exported properly.
```
## Cause
when the license comments appeared before the
xml-model instruction, it happedned.
## Solution
This PR changes places the xml-model declaration
immediately after the XML prolog and ahead of the
license block to resolve the issue.
We are standardizing our software under Apache License 2.0. This PR
replaces existing BSD 3-Clause License with Apache 2.0 in this
repository.
## About Copyright
All commits in this repository are made by Reazon Holdings, Inc.
members, so the copyright has been added as follows.
- `Copyright 2025 Reazon Holdings, Inc.`
```console
$ git shortlog -sn
55 Thomason Zhou
14 thomason
5 takuya kodama
1 Fujimoto Seiji
1 edwin-giang
1 toki
```
## How it was done
We added the new license header directory by directory, with each commit
covering a single directory to make review easier.
To ensure there are no missing files, we ran the following commands.
```
$ grep -RIL --exclude-dir='.git' --exclude='*.stl' "Apache License, Version 2.0" .
./openarm_bringup/README.md
./openarm_bimanual_moveit_config/README.md
./openarm_bimanual_description/urdf/openarm_bimanual.urdf
./.gitignore
./README.md
./openarm_description/urdf/openarm.urdf
./openarm_description/resource/openarm_description
```
The following files are auto-generated.
- openarm_bimanual_description/urdf/openarm_bimanual.urdf
- openarm_description/urdf/openarm.urdf
