docs: add ROS 2 env source step and fix conda package name in ros2 README

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

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

ros2/README.md

@@ -21,7 +21,7 @@ conda activate ros2_humble
 conda install -c robostack-staging -c conda-forge \
     colcon-common-extensions \
     ros-humble-ament-cmake \
-    python3-pip
+    pip
 
 # Python 依赖
 pip install pynput
@@ -72,6 +72,9 @@ pip install pynput
 ## 构建
 
 ```bash
+# 每次新终端都需要先加载 ROS 2 环境
+source /opt/ros/humble/setup.zsh
+
 cd ros2
 colcon build --symlink-install --packages-select udp_teleop
 source install/setup.bash