chore: Assets 디렉토리 구조 정리 및 네이밍 컨벤션 적용

- Assets/_Game/ 하위로 게임 에셋 통합
- External/ 패키지 벤더별 분류 (Synty, Animations, UI)
- 에셋 네이밍 컨벤션 확립 및 적용
  (Data_Skill_, Data_SkillEffect_, Prefab_, Anim_, Model_, BT_ 등)
- pre-commit hook으로 네이밍 컨벤션 자동 검사 추가
- RESTRUCTURE_CHECKLIST.md 작성

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

Assets/_Game/Scripts/AI/BehaviorActions/Actions/SetTargetInRangeAction.cs

@@ -0,0 +1,70 @@
+using System;
+using Unity.Behavior;
+using UnityEngine;
+using Action = Unity.Behavior.Action;
+using Unity.Properties;
+using Colosseum.Combat;
+
+[Serializable, GeneratePropertyBag]
+[NodeDescription(name: "SetTargetInRange", story: "[거리] 내에 [대상이] 있는지 확인", category: "Action", id: "93b7a5d823a58618d5371c01ef894948")]
+public partial class SetTargetInRangeAction : Action
+{
+    [SerializeReference]
+    public BlackboardVariable<GameObject> Target;
+
+    [SerializeReference]
+    public BlackboardVariable<string> Tag = new BlackboardVariable<string>("Player");
+
+    [SerializeReference]
+    public BlackboardVariable<float> Range = new BlackboardVariable<float>(10f);
+
+    protected override Status OnStart()
+    {
+        if (string.IsNullOrEmpty(Tag.Value))
+        {
+            return Status.Failure;
+        }
+
+        // 모든 타겟 태그 오브젝트 찾기
+        GameObject[] targets = GameObject.FindGameObjectsWithTag(Tag.Value);
+        
+        if (targets == null || targets.Length == 0)
+        {
+            return Status.Failure;
+        }
+
+        // 가장 가까운 살아있는 타겟 찾기
+        GameObject nearestTarget = null;
+        float nearestDistance = Range.Value; // Range 내에서만 검색
+
+        foreach (GameObject potentialTarget in targets)
+        {
+            // 사망한 타겟은 제외
+            IDamageable damageable = potentialTarget.GetComponent<IDamageable>();
+            if (damageable != null && damageable.IsDead)
+            {
+                continue;
+            }
+
+            float distance = Vector3.Distance(
+                GameObject.transform.position,
+                potentialTarget.transform.position
+            );
+
+            if (distance < nearestDistance)
+            {
+                nearestDistance = distance;
+                nearestTarget = potentialTarget;
+            }
+        }
+
+        if (nearestTarget == null)
+        {
+            return Status.Failure;
+        }
+
+        Target.Value = nearestTarget;
+        return Status.Success;
+    }
+}
+