fix: armor stacks to 64 + creative tab handler on wrong bus

- ShardDiamondArmorItem forced stacksTo(64): armor pieces stacked like
  items. Now explicitly stacksTo(1) (ArmorItem does not default to 1
  in 1.21.1, vanilla sets it per-item).
- CustomOreGenModTabs.buildTabContentsVanilla was subscribed on the
  GAME bus, but BuildCreativeModeTabContentsEvent is an IModBusEvent
  posted via ModLoader: the handler never fired and mod items never
  appeared in vanilla tabs. Moved to the MOD bus.

src/main/java/net/mcreator/customoregen/init/CustomOreGenModTabs.java

@@ -1,7 +1,3 @@
-
-/*
- *    MCreator note: This file will be REGENERATED on each build.
- */
 package net.mcreator.customoregen.init;
 
 import net.neoforged.neoforge.registries.DeferredRegister;
@@ -20,7 +16,7 @@ import net.mcreator.customoregen.CustomOreGenMod;
 
 import java.util.function.Supplier;
 
-@EventBusSubscriber(modid = CustomOreGenMod.MODID, bus = EventBusSubscriber.Bus.GAME)
+@EventBusSubscriber(modid = CustomOreGenMod.MODID, bus = EventBusSubscriber.Bus.MOD)
 public class CustomOreGenModTabs {
 	public static final DeferredRegister<CreativeModeTab> REGISTRY = DeferredRegister.create(Registries.CREATIVE_MODE_TAB, CustomOreGenMod.MODID);
 

src/main/java/net/mcreator/customoregen/item/ShardDiamondArmorItem.java

@@ -14,7 +14,7 @@ import net.mcreator.customoregen.config.ModConfigs;
 public abstract class ShardDiamondArmorItem extends ArmorItem {
 
 	public ShardDiamondArmorItem(ArmorItem.Type type, Item.Properties properties) {
-		super(ShardDiamondArmorMaterial.SHARD_DIAMOND, type, properties.stacksTo(64));
+		super(ShardDiamondArmorMaterial.SHARD_DIAMOND, type, properties.stacksTo(1));
 	}
 
 	/**