feat: 보스 패턴 시스템 구현

- BossPatternData SO로 스킬/Wait 스텝 순서와 쿨타임 정의
- UsePatternAction으로 Behavior Graph에서 패턴 실행
- 보스 전용 애니메이션 분리 및 AnimatorOverrideController 정상화

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Assets/Scripts/AI/BehaviorActions/Actions/UsePatternAction.cs

@@ -0,0 +1,117 @@
+using System;
+using Colosseum.AI;
+using Colosseum.Skills;
+using Unity.Behavior;
+using Unity.Properties;
+using UnityEngine;
+using Action = Unity.Behavior.Action;
+
+/// <summary>
+/// 보스 패턴을 실행하는 Behavior Tree Action.
+/// 패턴 내 스텝(스킬 또는 대기)을 순서대로 실행하며, 패턴 쿨타임을 관리합니다.
+/// </summary>
+[Serializable, GeneratePropertyBag]
+[NodeDescription(name: "Use Pattern", story: "[Pattern] 실행", category: "Action", id: "a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6")]
+public partial class UsePatternAction : Action
+{
+    [SerializeReference] public BlackboardVariable<BossPatternData> Pattern;
+
+    private SkillController skillController;
+    private int currentStepIndex;
+    private float waitEndTime;
+    private bool isWaiting;
+    private float lastUsedTime = float.MinValue;
+
+    protected override Status OnStart()
+    {
+        if (Pattern?.Value == null)
+        {
+            Debug.LogWarning("[UsePatternAction] 패턴이 null입니다.");
+            return Status.Failure;
+        }
+
+        if (Time.time - lastUsedTime < Pattern.Value.Cooldown)
+        {
+            return Status.Failure;
+        }
+
+        if (Pattern.Value.Steps.Count == 0)
+        {
+            return Status.Failure;
+        }
+
+        skillController = GameObject.GetComponent<SkillController>();
+        if (skillController == null)
+        {
+            Debug.LogWarning($"[UsePatternAction] SkillController를 찾을 수 없습니다: {GameObject.name}");
+            return Status.Failure;
+        }
+
+        currentStepIndex = 0;
+        isWaiting = false;
+        return ExecuteCurrentStep();
+    }
+
+    protected override Status OnUpdate()
+    {
+        if (skillController == null)
+            return Status.Failure;
+
+        if (isWaiting)
+        {
+            if (Time.time < waitEndTime)
+                return Status.Running;
+
+            isWaiting = false;
+        }
+        else
+        {
+            if (skillController.IsPlayingAnimation)
+                return Status.Running;
+
+        }
+
+        currentStepIndex++;
+
+        if (currentStepIndex >= Pattern.Value.Steps.Count)
+        {
+            lastUsedTime = Time.time;
+            return Status.Success;
+        }
+
+        return ExecuteCurrentStep();
+    }
+
+    protected override void OnEnd()
+    {
+        skillController = null;
+    }
+
+    private Status ExecuteCurrentStep()
+    {
+        PatternStep step = Pattern.Value.Steps[currentStepIndex];
+
+        if (step.Type == PatternStepType.Wait)
+        {
+            isWaiting = true;
+            waitEndTime = Time.time + step.Duration;
+            return Status.Running;
+        }
+
+        // PatternStepType.Skill
+        if (step.Skill == null)
+        {
+            Debug.LogWarning($"[UsePatternAction] 스킬이 null입니다. (index {currentStepIndex})");
+            return Status.Failure;
+        }
+
+        bool success = skillController.ExecuteSkill(step.Skill);
+        if (!success)
+        {
+            Debug.LogWarning($"[UsePatternAction] 스킬 실행 실패: {step.Skill.SkillName} (index {currentStepIndex})");
+            return Status.Failure;
+        }
+
+        return Status.Running;
+    }
+}