Add lobby/game worlds, void generator, dbd reload, and fix plugin loading

- Add VoidWorldGenerator for empty void worlds
- Add LobbyManager with auto-creation of lobby world (stone platform 7x7, built once) and game world
- Add /dbd reload command to reload all configs at runtime
- Add plugin.yml for proper command registration, remove paper-plugin.yml
- Fix mdbdBootstrap/mdbdLoader public constructors (Paper requirement)
- Fix command registration (getCommand null on Paper plugin system)

src/main/java/dev/loki/objective/Generator.java

@@ -1,12 +1,16 @@
 package dev.loki.objective;
 
+import dev.loki.data.GeneratorDataManager;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+
 import java.util.UUID;
 
 public class Generator {
     private final int id;
     private final Location location;
+    private final double zoneRadius;
     private double progress;
     private boolean isCompleted;
     private boolean isBlocked;
@@ -15,8 +19,13 @@ public class Generator {
     private boolean wasKicked;
 
     public Generator(int id, Location location) {
+        this(id, location, GeneratorDataManager.getZoneRadius());
+    }
+
+    public Generator(int id, Location location, double zoneRadius) {
         this.id = id;
         this.location = location;
+        this.zoneRadius = zoneRadius;
         this.progress = 0.0;
         this.isCompleted = false;
         this.isBlocked = false;
@@ -33,6 +42,20 @@ public class Generator {
         return location;
     }
 
+    public double getZoneRadius() {
+        return zoneRadius;
+    }
+
+    public boolean isPlayerInZone(Player player) {
+        if (!player.getWorld().equals(location.getWorld())) return false;
+        return player.getLocation().distance(location) <= zoneRadius;
+    }
+
+    public boolean isLocationInZone(Location loc) {
+        if (!loc.getWorld().equals(location.getWorld())) return false;
+        return loc.distance(location) <= zoneRadius;
+    }
+
     public double getProgress() {
         return progress;
     }
@@ -107,6 +130,7 @@ public class Generator {
         return !isCompleted && !isBlocked;
     }
 
+    @Deprecated
     public Block getBlock() {
         return location.getBlock();
     }