migrated to Gradle and Minestom 2026.10.05-26.2

- Maven -> Gradle 9.6.1 (shadow 9.6.1, Java 25), shadow jar is build/libs/limbo.jar
- Minestom from Maven Central (net.minestom:minestom), speaks Minecraft 26.2 natively
- Velocity forwarding via Auth.Velocity; the secret is no longer hardcoded but read from
  forwarding.secret in the working directory or VELOCITY_FORWARDING_SECRET
- time rate via defaultClock().pause() (new clock API)
- slf4j-simple for logging (Minestom no longer ships a logger)
- removed target/ and Maven files from the repository
- uploadLimbo task copies the jar to the limbo server

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/java/eu/mhsl/minecraft/endlessjumper/EndlessJumper.java

@@ -1,6 +1,7 @@
 package eu.mhsl.minecraft.endlessjumper;
 
 import eu.mhsl.minecraft.endlessjumper.generator.JumpGenerator;
+import net.minestom.server.Auth;
 import net.minestom.server.MinecraftServer;
 import net.minestom.server.coordinate.Pos;
 import net.minestom.server.entity.Player;
@@ -10,17 +11,19 @@ import net.minestom.server.event.player.AsyncPlayerConfigurationEvent;
 import net.minestom.server.event.player.PlayerBlockBreakEvent;
 import net.minestom.server.event.player.PlayerDisconnectEvent;
 import net.minestom.server.event.player.PlayerMoveEvent;
-import net.minestom.server.extras.velocity.VelocityProxy;
 import net.minestom.server.instance.InstanceContainer;
 import net.minestom.server.instance.InstanceManager;
 import net.minestom.server.instance.block.Block;
 import net.minestom.server.timer.TaskSchedule;
 
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.HashMap;
 
 public class EndlessJumper {
-    public static void main(String[] args) {
-        MinecraftServer server = MinecraftServer.init();
+    public static void main(String[] args) throws IOException {
+        MinecraftServer server = MinecraftServer.init(new Auth.Velocity(readForwardingSecret()));
         InstanceManager instanceManager = MinecraftServer.getInstanceManager();
         GlobalEventHandler eventHandler = MinecraftServer.getGlobalEventHandler();
         PlayerSkin skin = PlayerSkin.fromUsername("Notch");
@@ -37,7 +40,7 @@ public class EndlessJumper {
             Pos startingAt = new Pos(0,100,0);
             world.setBlock(startingAt, Block.DIAMOND_BLOCK);
 
-            world.setTimeRate(0);
+            world.defaultClock().pause();
             world.setTime(18000);
 
             p.setSkin(skin);
@@ -81,8 +84,18 @@ public class EndlessJumper {
 
         eventHandler.addListener(PlayerDisconnectEvent.class, event -> games.remove(event.getPlayer()));
 
-        VelocityProxy.enable("iph0YHK9jNWZ");
         server.start("0.0.0.0", 25501);
 
     }
+
+    // Wie bei Velocity: Secret aus forwarding.secret im Arbeitsverzeichnis, alternativ per Umgebungsvariable
+    private static String readForwardingSecret() throws IOException {
+        String fromEnv = System.getenv("VELOCITY_FORWARDING_SECRET");
+        if(fromEnv != null && !fromEnv.isBlank()) return fromEnv.trim();
+
+        Path file = Path.of("forwarding.secret");
+        if(!Files.exists(file))
+            throw new IllegalStateException("forwarding.secret fehlt im Arbeitsverzeichnis (oder VELOCITY_FORWARDING_SECRET setzen)");
+        return Files.readString(file).trim();
+    }
 }