added backend code

TurboPi/HiwonderSDK/BuzzerControlDemo.py

TurboPi/HiwonderSDK/FourInfrared.py

TurboPi/HiwonderSDK/Misc.py

TurboPi/HiwonderSDK/MotorControlDemo.py

TurboPi/HiwonderSDK/PID.py

TurboPi/HiwonderSDK/PWMServoControlDemo.py

TurboPi/HiwonderSDK/RGBControlDemo.py

TurboPi/HiwonderSDK/Sonar.py

TurboPi/HiwonderSDK/hardware_test.py

TurboPi/HiwonderSDK/key.py

TurboPi/HiwonderSDK/led.py

TurboPi/HiwonderSDK/mecanum.py

TurboPi/HiwonderSDK/ros_robot_controller_sdk.py

backend/robot.py

backend/server.py

bluetooth/bt_server.py

frontend/src/renderer/src/components/CarController.tsx

frontend/src/renderer/src/components/DirectionalControls.tsx

frontend/src/renderer/src/components/LogViewer.tsx

frontend/src/renderer/src/components/SidePanel.tsx