Added banned-rules support for categories - allows excluding specific items from a category even if they match the inclusion rules. For example, a netherite hoe would normally appear in the "Tools" category, but if it has a specific CustomModelData (e.g., 300), it can be excluded using a banned rule. Uses the same rule types as regular rules (material, tag, lore, custom-model-data, etc.)
Added Broadcast system - sends messages to all online players when items are...
