完善后端析构逻辑以及优化日志性能

src/Core/backendInterface.cpp

@@ -20,10 +20,16 @@ public:
 
     }
     void cleanup() override {
-        
+        if (_detProcess != nullptr){
+            delete _detProcess;
+            _detProcess = nullptr;
+        }
     }
     ~Backend() {
-        delete _detProcess;
+        if (_detProcess != nullptr) {
+            delete _detProcess;
+            _detProcess = nullptr;
+        }
     }
     bool excuteCliCommand(const QString& command) {
         return _detProcess->_cliManager->cliCommand(command);
@@ -33,7 +39,7 @@ public:
     }
 private:
     bool initOnce = false;
-    detProcess* _detProcess;
+    detProcess* _detProcess = nullptr;
     qtFuncBridge* bridge = nullptr;
 };