refactor(low_controller): 移除停止时的线程清理并添加CPU ID宏定义

移除LowController::stop()中不必要的线程清理代码，因为running_标志位已足够控制线程行为
在头文件中添加UT_CPU_ID_NONE宏定义用于CPU标识

include/low_controller.hpp

@@ -10,7 +10,7 @@
 
 constexpr double PosStopF = (2.146E+9f);
 constexpr double VelStopF = (16000.0f);
-
+#define UT_CPU_ID_NONE  -1
 namespace custom {
 
 class LowController {

src/low_controller.cpp

@@ -37,11 +37,6 @@ bool LowController::stop()
     if(running_)
     {
         running_ = false;
-        if (publish_thread_)
-        {
-            publish_thread_->join();
-            publish_thread_.reset();
-        }
     }
     return true;
 }