```

feat(app): 添加窗口关闭事件处理机制

- 在主应用类中引入 JavaFX 平台相关类，用于监听窗口关闭事件
- 实现 handleCloseEvent 方法，在用户关闭主窗口时优雅地关闭 Spring 上下文并退出 JVM
- 提取 closeApplicationContext 方法，确保 ApplicationContext 安全关闭
- LoginView 中引入 DesktopApplication 和 Platform 类，支持窗口事件处理逻辑
```

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

@@ -2,7 +2,9 @@ package com.fantaibao;
 
 import com.fantaibao.page.LoginView;
 import javafx.application.Application;
+import javafx.application.Platform;
 import javafx.stage.Stage;
+import javafx.stage.WindowEvent;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
@@ -27,14 +29,31 @@ public class DesktopApplication extends Application {
 
     @Override
     public void start(Stage primaryStage) {
+        // 添加窗口关闭事件监听器
+        primaryStage.setOnCloseRequest(this::handleCloseEvent);
         // 直接启动登录界面
         new LoginView(primaryStage);
     }
 
     @Override
     public void stop() {
-        if (applicationContext != null) {
+        closeApplicationContext();
+    }
+
+    /**
+     * 关闭Spring Boot应用上下文
+     */
+    public static void closeApplicationContext() {
+        if (applicationContext != null && applicationContext.isRunning()) {
             applicationContext.close();
         }
     }
+
+    private void handleCloseEvent(WindowEvent event) {
+        // 关闭Spring Boot应用上下文
+        closeApplicationContext();
+        // 退出JVM
+        Platform.exit();
+        System.exit(0);
+    }
 }

src/main/java/com/fantaibao/page/LoginView.java

@@ -1,5 +1,7 @@
 package com.fantaibao.page;
 
+import com.fantaibao.DesktopApplication;
+import javafx.application.Platform;
 import javafx.geometry.Insets;
 import javafx.geometry.Pos;
 import javafx.scene.Scene;
@@ -9,6 +11,7 @@ import javafx.scene.control.PasswordField;
 import javafx.scene.control.TextField;
 import javafx.scene.layout.VBox;
 import javafx.stage.Stage;
+import javafx.stage.WindowEvent;
 
 public class LoginView {