getEnchantBonus
Calculates the enchantment bonus for a single item, converted to armor-level units.
Always includes general Protection. Additionally includes the type-specific protection enchantment if the damage type matches:
- PROJECTILE → + Projectile Protection
- EXPLOSION → + Blast Protection
- FIRE → + Fire Protection
- MELEE/OTHER → general Protection only
Uses getEnchantment which handles both elite items (reads from PersistentDataContainer) and vanilla items (falls back to getEnchantLevel()).
The raw enchantment level sum is multiplied by ENCHANT_SCALE (1/3) to convert to armor-level-equivalent units.
Example: An item with Protection IV + Projectile Protection III, evaluated against PROJECTILE damage: (4 + 3) * (1/3) = 2.33 armor-level units.
Return
The enchant bonus in armor-level-equivalent units (0 if null or no enchants)
Parameters
The item to evaluate (may be null)
The damage type being defended against