Add Lightning mana type, AOE spells, room types, and monster armor
Features added:
- Lightning mana type (Fire + Air composite)
- AOE spells (Chain Lightning, Fireball AOE, Blizzard, etc.)
- Magic sword enchantments (Fire Blade, Frost Blade, Lightning Blade)
- Monster armor system (all guardians have armor, scales with floors)
- Room types (puzzle, swarm, speed) with generation logic
- FloorState and EnemyState types for room handling
- Weapon mana storage fields for future magic sword system
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