fix: 注册 JVM ShutdownHook，修复 Vert.x 实例进程退出时不关闭的资源泄漏

Deploy.deployVerticle() 中创建的 Vert.x 实例是局部变量，进程退出时无法优雅关闭，
导致 Netty EventLoopGroup、JDBC 连接池、内部定时器等资源泄漏。
添加 ShutdownHook 在 JVM 关闭时调用 vertx.close() 级联释放所有资源。

core/src/main/java/cn/qaiu/vx/core/Deploy.java

@@ -43,6 +43,7 @@ public final class Deploy {
     private Handler<JsonObject> handle;
 
     private Thread mainThread;
+    private Vertx mainVertx;
 
     public static Deploy instance() {
         return INSTANCE;
@@ -137,6 +138,14 @@ public final class Deploy {
                 vertxOptions.getWorkerPoolSize());
         var vertx = Vertx.vertx(vertxOptions);
         VertxHolder.init(vertx);
+        this.mainVertx = vertx;
+
+        // 注册 ShutdownHook，确保进程退出时优雅关闭资源
+        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+            LOGGER.info("JVM shutting down, closing Vert.x...");
+            vertx.close().onComplete(ar ->
+                    LOGGER.info("Vert.x closed: {}", ar.succeeded() ? "success" : ar.cause().getMessage()));
+        }));
         //配置保存在共享数据中
         var sharedData = vertx.sharedData();
         LocalMap<String, Object> localMap = sharedData.getLocalMap(LOCAL);