코드 리팩토링

재사용성 및 확장성을 고려하여 코드 전반을 리팩토링함

Assets/Scripts/Player/PlaceableBehavior.cs

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+using UnityEngine;
+
+/// <summary>
+/// Placeable behavior for building/placing items.
+/// </summary>
+[CreateAssetMenu(menuName = "Items/Behaviors/Placeable Behavior")]
+public class PlaceableBehavior : ItemBehavior
+{
+    [Header("Placement Settings")]
+    [SerializeField] private GameObject placeablePrefab;
+    [SerializeField] private bool requiresGround = true;
+    [SerializeField] private float placementRange = 5f;
+
+    public override bool IsConsumable => true;
+
+    private void OnEnable()
+    {
+        if (string.IsNullOrEmpty(behaviorName)) behaviorName = "Place";
+        if (string.IsNullOrEmpty(animTrigger)) animTrigger = "Place";
+        canRepeat = false;
+    }
+
+    public override bool CanUse(GameObject user, GameObject target)
+    {
+        // Would integrate with BuildManager for placement validation
+        return placeablePrefab != null;
+    }
+
+    public override void Use(GameObject user, GameObject target)
+    {
+        // Actual placement would be handled by BuildManager
+        // This is a placeholder for the behavior pattern
+        Debug.Log($"[PlaceableBehavior] Would place {placeablePrefab?.name}");
+    }
+
+    public override string GetBlockedReason(GameObject user, GameObject target)
+    {
+        if (placeablePrefab == null) return "Invalid placement item";
+        return null;
+    }
+}