Stackable Armor and Tools

Added stack support for clean vanilla armor, swords, pickaxes, axes, shovels, and hoes. Clean supported gear can now stack up to 16 in inventories. Added server-safe stacking rules for armor and tools. Added support for armor detection through ArmorItem. Added vanilla tool and weapon class detection for swords, pickaxes, axes, shovels, and hoes. Added item entity merge handling so supported gear can stack properly when dropped. Added inventory, slot, and container handling so stacks behave correctly in menus. Added creative inventory handling for supported stacked gear. Added config support for stack behavior. Added optional debug logging support. Changed Supported gear only stacks when it is clean and safe to stack. Gear must have Damage: 0. Gear must have no special Forge capability data. Debug logging is disabled by default in both source config and dev config. Fixed Fixed armor and tools not respecting custom stack limits in player inventories. Fixed stacked gear behavior across slots, menus, item entities, and creative inventory. Fixed unsafe stacking cases by blocking damaged or modified gear from stacking