refactor: 스킬 트리거 효과를 그룹 구조로 변경 — 하나의 애니메이션 이벤트로 여러 effect 발동 가능

- SkillGemTriggeredEffectEntry를 공용 타입 SkillTriggeredEffectEntry로 승격

- SkillData.effects를 List<SkillTriggeredEffectEntry>로 변경 (기존 flat list는 OnValidate에서 자동 마이그레이션)

- SkillLoadoutEntry, PlayerSkillInput 등 소비자 코드 그룹 구조 대응

- 기존 스킬 에셋 마이그레이션 완료

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/_Game/Scripts/Skills/SkillLoadoutEntry.cs

@@ -321,15 +321,22 @@ namespace Colosseum.Skills
             if (destination == null)
                 return;
 
-            if (baseSkill != null && baseSkill.Effects != null)
+            if (baseSkill != null && baseSkill.TriggeredEffects != null)
             {
-                for (int i = 0; i < baseSkill.Effects.Count; i++)
+                for (int i = 0; i < baseSkill.TriggeredEffects.Count; i++)
                 {
-                    SkillEffect effect = baseSkill.Effects[i];
-                    if (effect == null)
+                    SkillTriggeredEffectEntry entry = baseSkill.TriggeredEffects[i];
+                    if (entry == null || entry.Effects == null)
                         continue;
 
-                    AddTriggeredEffect(destination, i, effect);
+                    for (int j = 0; j < entry.Effects.Count; j++)
+                    {
+                        SkillEffect effect = entry.Effects[j];
+                        if (effect == null)
+                            continue;
+
+                        AddTriggeredEffect(destination, entry.TriggerIndex, effect);
+                    }
                 }
             }
 
@@ -344,7 +351,7 @@ namespace Colosseum.Skills
 
                 for (int j = 0; j < gem.TriggeredEffects.Count; j++)
                 {
-                    SkillGemTriggeredEffectEntry entry = gem.TriggeredEffects[j];
+                    SkillTriggeredEffectEntry entry = gem.TriggeredEffects[j];
                     if (entry == null || entry.Effects == null)
                         continue;
 
@@ -499,7 +506,7 @@ namespace Colosseum.Skills
             {
                 if (baseSkill.CastStartEffects != null && CheckEffectsForTargetType(baseSkill.CastStartEffects, type))
                     return true;
-                if (baseSkill.Effects != null && CheckEffectsForTargetType(baseSkill.Effects, type))
+                if (baseSkill.TriggeredEffects != null && CheckTriggeredEntriesForTargetType(baseSkill.TriggeredEffects, type))
                     return true;
             }
 
@@ -514,17 +521,22 @@ namespace Colosseum.Skills
                 if (gem.CastStartEffects != null && CheckEffectsForTargetType(gem.CastStartEffects, type))
                     return true;
 
-                if (gem.TriggeredEffects != null)
-                {
-                    for (int j = 0; j < gem.TriggeredEffects.Count; j++)
-                    {
-                        SkillGemTriggeredEffectEntry entry = gem.TriggeredEffects[j];
-                        if (entry == null || entry.Effects == null) continue;
+                if (gem.TriggeredEffects != null && CheckTriggeredEntriesForTargetType(gem.TriggeredEffects, type))
+                    return true;
+            }
 
-                        if (CheckEffectsForTargetType(entry.Effects, type))
-                            return true;
-                    }
-                }
+            return false;
+        }
+
+        private static bool CheckTriggeredEntriesForTargetType(IReadOnlyList<SkillTriggeredEffectEntry> entries, TargetType type)
+        {
+            if (entries == null) return false;
+
+            for (int i = 0; i < entries.Count; i++)
+            {
+                SkillTriggeredEffectEntry entry = entries[i];
+                if (entry != null && CheckEffectsForTargetType(entry.Effects, type))
+                    return true;
             }
 
             return false;