Added Stalinium Pickaxe with full functionality, including model, recipe, localization, and creative tab entry. Adjusted attack speed modifier for Stalinium Charge Effect for better balance.

src/main/java/net/krituximon/stalinium/item/StaliniumPickaxeItem.java

@@ -0,0 +1,26 @@
+package net.krituximon.stalinium.item;
+
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.item.*;
+
+public class StaliniumPickaxeItem extends PickaxeItem {
+    public StaliniumPickaxeItem(Tier tier, Item.Properties properties) {
+        super(tier, properties);
+    }
+
+    @Override
+    public boolean hurtEnemy(ItemStack stack, LivingEntity target, LivingEntity attacker) {
+        return true;
+    }
+
+    @Override
+    public boolean isDamageable(ItemStack stack) {
+        return false;
+    }
+
+    @Override
+    public boolean isDamaged(ItemStack stack) {
+        return false;
+    }
+}
+