refactor(engine): 스킬 및 전투 시스템 개선

- SkillData 조정
- CombatCalculator 개선
- ItemService 업데이트
- ProgressService 개선
- SkillService 정리

lib/data/skill_data.dart

@@ -19,7 +19,7 @@ class SkillData {
     mpCost: 10,
     cooldownMs: 3000,
     power: 15,
-    damageMultiplier: 1.5,
+    damageMultiplier: 2.0,
   );
 
   /// Core Dump - 중급 공격
@@ -56,7 +56,7 @@ class SkillData {
     mpCost: 80,
     cooldownMs: 45000,
     power: 60,
-    damageMultiplier: 6.0,
+    damageMultiplier: 4.0,
     selfDamagePercent: 0.1,
   );
 
@@ -68,7 +68,7 @@ class SkillData {
     mpCost: 60,
     cooldownMs: 30000,
     power: 50,
-    damageMultiplier: 5.0,
+    damageMultiplier: 3.5,
   );
 
   /// Inject Code - 방어 무시 공격
@@ -91,7 +91,7 @@ class SkillData {
     mpCost: 30,
     cooldownMs: 10000,
     power: 12,
-    damageMultiplier: 1.2,
+    damageMultiplier: 2.0,
     hitCount: 3,
   );
 
@@ -103,7 +103,7 @@ class SkillData {
     mpCost: 45,
     cooldownMs: 15000,
     power: 10,
-    damageMultiplier: 1.0,
+    damageMultiplier: 2.0,
     hitCount: 5,
   );
 
@@ -139,7 +139,7 @@ class SkillData {
     mpCost: 50,
     cooldownMs: 25000,
     power: 40,
-    damageMultiplier: 3.5,
+    damageMultiplier: 3.2,
     element: SkillElement.chaos,
   );
 
@@ -151,7 +151,7 @@ class SkillData {
     mpCost: 55,
     cooldownMs: 20000,
     power: 18,
-    damageMultiplier: 1.8,
+    damageMultiplier: 2.2,
     hitCount: 3,
   );
 
@@ -212,7 +212,7 @@ class SkillData {
     mpCost: 15,
     cooldownMs: 6000,
     power: 12,
-    damageMultiplier: 1.3,
+    damageMultiplier: 2.0,
   );
 
   /// A/B Test - 이중 공격
@@ -223,7 +223,7 @@ class SkillData {
     mpCost: 35,
     cooldownMs: 12000,
     power: 15,
-    damageMultiplier: 1.5,
+    damageMultiplier: 2.0,
     hitCount: 2,
   );
 

lib/src/core/engine/combat_calculator.dart

@@ -98,8 +98,9 @@ class CombatCalculator {
     final isParried = parryRoll < defenderParryRate;
 
     // 3. 기본 데미지 계산 (0.8 ~ 1.2 변동)
+    // DEF 감산 비율: 0.3 (기존 0.5에서 축소하여 의미있는 피해 보장)
     final damageVariation = 0.8 + rng.nextDouble() * 0.4;
-    var baseDamage = (attackerAtk * damageVariation - defenderDef * 0.5);
+    var baseDamage = (attackerAtk * damageVariation - defenderDef * 0.3);
 
     // 4. 크리티컬 판정
     final criRoll = rng.nextDouble();

lib/src/core/engine/item_service.dart

@@ -85,12 +85,13 @@ class ItemService {
   // ============================================================================
 
   /// 아이템 스탯 생성 (레벨/희귀도/슬롯 기반)
+  /// baseValue 공식: level * 1.2 * rarity (DEF 스케일링 축소)
   ItemStats generateItemStats({
     required int level,
     required ItemRarity rarity,
     required EquipmentSlot slot,
   }) {
-    final baseValue = (level * 2 * rarity.multiplier).round();
+    final baseValue = (level * 1.2 * rarity.multiplier).round();
 
     return switch (slot) {
       EquipmentSlot.weapon => _generateWeaponStats(baseValue, rarity),

lib/src/core/engine/progress_service.dart

@@ -882,6 +882,12 @@ class ProgressService {
       nextState = _levelUp(nextState);
     }
 
+    // 모든 장비 슬롯을 목표 레벨에 맞는 장비로 교체 (전투 보상 드랍 공식 사용)
+    final equipLevel = nextState.traits.level;
+    for (var slotIndex = 0; slotIndex < Equipment.slotCount; slotIndex++) {
+      nextState = mutations.winEquipByIndex(nextState, equipLevel, slotIndex);
+    }
+
     // 태스크 바 완료 처리
     var progress = nextState.progress.copyWith(
       task: nextState.progress.task.copyWith(

lib/src/core/engine/skill_service.dart

@@ -68,8 +68,8 @@ class SkillService {
     // 적 방어력 감소 적용
     final effectiveMonsterDef = monster.def * (1 - skill.targetDefReduction);
 
-    // 최종 데미지 계산 (방어력 감산)
+    // 최종 데미지 계산 (방어력 감산 0.3)
-    final finalDamage = (buffedDamage - effectiveMonsterDef * 0.5)
+    final finalDamage = (buffedDamage - effectiveMonsterDef * 0.3)
         .round()
         .clamp(1, 9999);
 
@@ -626,8 +626,8 @@ class SkillService {
     // 적 방어력 감소 적용
     final effectiveMonsterDef = monster.def * (1 - skill.targetDefReduction);
 
-    // 최종 데미지 계산 (방어력 감산)
+    // 최종 데미지 계산 (방어력 감산 0.3)
-    final finalDamage = (buffedDamage - effectiveMonsterDef * 0.5)
+    final finalDamage = (buffedDamage - effectiveMonsterDef * 0.3)
         .round()
         .clamp(1, 9999);