fix SDK build and Python packaging for ubuntu 20.04

[Rorschach2333]

中文

本 PR 修复 Panthera-HT SDK 的构建与安装问题：

• 兼容 CMake 4.x
• 统一 hightorque_motor CMake 包名和导出目标
• 修复 Python 绑定链接错误
• 支持将 Python 扩展正确安装到 site-packages
• 修复 conda Python 解释器选择
• 兼容 robot.name 与 robot.robot_name
• 串口设备缺失时返回明确错误，避免段错误
• 更新相关 README 和构建流程

已验证：

• motor_cpp 完整编译成功
• Python wheel 构建成功
• Python 包可在任意目录导入

English

This PR fixes build and installation issues in the Panthera-HT SDK:

• Add CMake 4.x compatibility
• Align the hightorque_motor CMake package and exported target names
• Fix Python binding linkage
• Install the Python extension correctly into site-packages
• Use the correct Python interpreter in conda environments
• Support both robot.name and robot.robot_name
• Report missing serial devices clearly instead of crashing
• Update the related README files and build instructions

Validated:

• Full motor_cpp build succeeds
• Python wheel builds successfully
• The Python package imports correctly from any directory

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR standardizes the SDK naming and build/install workflow across C++ and Python, aligning the exported CMake package name with hightorque_motor and updating docs and configs accordingly.

Changes:

• Switch Python binding and CMake integration to depend on hightorque_motor (exported target hightorque_motor::hightorque_motor) instead of hightorque_robot.
• Update build/install instructions to modern CMake (-S/-B, cmake --build, cmake --install) and pip-based Python installs.
• Update robot YAML naming (robot.name → robot.robot_name) and make C++ config parsing backward-compatible.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
panthera_python/setup.py	Passes Python3_EXECUTABLE to CMake to match find_package(Python3 ...).
panthera_python/scripts/motor_example/motor_README.md	Updates build commands and pip usage in example docs.
panthera_python/robot_param/Leader.yaml	Renames YAML key to robot_name.
panthera_python/robot_param/Follower.yaml	Renames YAML key to robot_name.
panthera_python/hightorque_robot/init.py	Adds package init to re-export pybind symbols.
panthera_python/README.md	Clarifies module/package relationships; updates build/install + verification steps.
panthera_python/CMakeLists.txt	Links Python extension against hightorque_motor::hightorque_motor; adjusts output dir logic.
panthera_cpp/robot_cpp/README.md	Clarifies build boundaries for robot_cpp vs installed motor SDK.
panthera_cpp/motor_cpp/src/hardware/robot.cpp	Improves YAML validation/backward compatibility; adds serial_id range check.
panthera_cpp/motor_cpp/doc/CLAUDE.md	Updates build/install instructions to modern CMake commands.
panthera_cpp/motor_cpp/cmake/hightorque_robotConfig.cmake.in	Updates package config contents to hightorque_motor naming and targets.
panthera_cpp/motor_cpp/README.md	Documents package/target names and updated build/install instructions.
panthera_cpp/motor_cpp/CMakeLists.txt	Raises CMake minimum version; switches config template filename to hightorque_motorConfig.cmake.in.
panthera_cpp/README.md	Adds naming mapping and clarifies when installing motor_cpp is required.
	Updates a usage guide to hightorque_motor naming and modern CMake workflow, but file path is missing in the diff metadata.

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