PotionCombatModifierCalculator

Centralizes combat-relevant potion math so incoming and outgoing damage stay symmetric.

All supported effects use percentage-per-amplifier values from MobCombatSettingsConfig:

• Resistance reduces incoming damage via getResistanceDamageMultiplier
• Strength increases outgoing damage via getStrengthDamageMultiplier
• Weakness reduces outgoing damage via getWeaknessDamageMultiplier

Strength and Weakness are combined linearly so equal levels cancel exactly.