fix(DesktopApplication): 优化应用关闭流程以确保线程池正确关闭在处理窗口关闭事件时，调整了资源清理顺序，优先关闭线程池再关闭Spring应用上下文，确保应用能够优雅地释放所有资源并正常退出。

src/main/java/com/fantaibao/DesktopApplication.java

@@ -12,6 +12,7 @@ import javafx.stage.WindowEvent;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 
 @SpringBootApplication
 public class DesktopApplication extends Application {
@@ -63,10 +64,12 @@ public class DesktopApplication extends Application {
     }
 
     private void handleCloseEvent(WindowEvent event) {
-        // 关闭Spring Boot应用上下文
-        closeApplicationContext();
         // 关闭Playwright实例
         PlaywrightManager.getInstance().close();
+        // 关闭线程池
+        applicationContext.getBean(ThreadPoolTaskExecutor.class).shutdown();
+        // 关闭Spring Boot应用上下文
+        closeApplicationContext();
         // 退出JVM
         Platform.exit();
         System.exit(0);