[AI] Behavior Actions 시스템 추가

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

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

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

@@ -0,0 +1,54 @@
+using System;
+using Unity.Behavior;
+using UnityEngine;
+using Action = Unity.Behavior.Action;
+using Unity.Properties;
+
+[Serializable, GeneratePropertyBag]
+[NodeDescription(name: "RotateToTarget", story: "[대상을] 바라보도록 회전", category: "Action", id: "30341f7e1af0565c0aca0253341b3e28")]
+public partial class RotateToTargetAction : Action
+{
+    [SerializeReference]
+    public BlackboardVariable<GameObject> Target;
+
+    [SerializeReference]
+    public BlackboardVariable<float> RotationSpeed = new BlackboardVariable<float>(10f);
+
+    [SerializeReference]
+    public BlackboardVariable<float> AngleThreshold = new BlackboardVariable<float>(5f);
+
+    protected override Status OnUpdate()
+    {
+        if (Target.Value == null)
+        {
+            return Status.Failure;
+        }
+
+        Vector3 direction = Target.Value.transform.position - GameObject.transform.position;
+        direction.y = 0f;
+
+        if (direction == Vector3.zero)
+        {
+            return Status.Success;
+        }
+
+        Quaternion targetRotation = Quaternion.LookRotation(direction);
+        float angleDifference = Quaternion.Angle(GameObject.transform.rotation, targetRotation);
+
+        // 임계값 이내면 성공
+        if (angleDifference <= AngleThreshold.Value)
+        {
+            return Status.Success;
+        }
+
+        // 부드럽게 회전
+        GameObject.transform.rotation = Quaternion.Slerp(
+            GameObject.transform.rotation,
+            targetRotation,
+            RotationSpeed.Value * Time.deltaTime
+        );
+
+        return Status.Running;
+    }
+}
+