feat: 添加玩家虚空回spawn功能

- 新增LimboBackSpawn类继承LimboPlugin并实现Listener接口
- 在onEnable方法中注册事件监听器和设置spawn点
- 实现PlayerMoveEvent事件处理，当玩家掉入虚空时自动传回spawn点
- 添加plugin.yml配置文件，定义插件基本信息

.idea/misc.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="EntryPointsManager">
+    <list size="1">
+      <item index="0" class="java.lang.String" itemvalue="com.loohp.limbo.events.EventHandler" />
+    </list>
+  </component>
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="MavenProjectsManager">
     <option name="originalFiles">

src/main/java/com/blockfantasy/LimboBackSpawn.java

@@ -1,4 +1,31 @@
 package com.blockfantasy;
 
-public class LimboBackSpawn {
+import com.loohp.limbo.Limbo;
+import com.loohp.limbo.events.EventHandler;
+import com.loohp.limbo.events.Listener;
+import com.loohp.limbo.events.player.PlayerMoveEvent;
+import com.loohp.limbo.location.Location;
+import com.loohp.limbo.player.Player;
+import com.loohp.limbo.plugins.LimboPlugin;
+
+public class LimboBackSpawn extends LimboPlugin implements Listener {
+    public static LimboBackSpawn instance;
+    public static Location spawn;
+    @Override
+    public void onEnable() {
+        instance = this;
+        spawn = instance.getServer().getServerProperties().getWorldSpawn();
+        Limbo.getInstance().getEventsManager().registerEvents(this,new LimboBackSpawnListener());
+    }
+
+    public static class LimboBackSpawnListener implements Listener {
+        @EventHandler
+        public void onPlayerMove(PlayerMoveEvent event) {
+            Player player = event.getPlayer();
+            if (event.getPlayer().getLocation().getY() < -10) {
+                player.teleport(spawn);
+                player.sendMessage("§b[BlockFantasy]§c掉虚空了?我给你拽回来~");
+            }
+        }
+    }
 }

src/main/resources/plugin.yml

@@ -0,0 +1,4 @@
+name: LimboBackSpawn
+main: com.blockfantasy.LimboBackSpawn
+version: 1.0.0
+author: BlockFantasy