코드 리팩토링

재사용성 및 확장성을 고려하여 코드 전반을 리팩토링함

Assets/Scripts/Items/IUsableItem.cs

@@ -0,0 +1,63 @@
+using UnityEngine;
+
+/// <summary>
+/// Interface for items that can be used/activated by the player.
+/// </summary>
+public interface IUsableItem
+{
+    /// <summary>
+    /// Check if the item can be used.
+    /// </summary>
+    /// <param name="user">The GameObject using the item (player)</param>
+    /// <param name="target">Optional target for the use action</param>
+    /// <returns>True if the item can be used</returns>
+    bool CanUse(GameObject user, GameObject target);
+
+    /// <summary>
+    /// Use the item.
+    /// </summary>
+    /// <param name="user">The GameObject using the item (player)</param>
+    /// <param name="target">Optional target for the use action</param>
+    void Use(GameObject user, GameObject target);
+
+    /// <summary>
+    /// Get the action descriptor for using this item.
+    /// </summary>
+    ActionDescriptor GetUseAction();
+
+    /// <summary>
+    /// Whether using this item consumes it (reduces stack count).
+    /// </summary>
+    bool IsConsumable { get; }
+}
+
+/// <summary>
+/// Interface for items that can be equipped on the player.
+/// </summary>
+public interface IEquippableItem
+{
+    /// <summary>
+    /// Get the equipment prefab to spawn.
+    /// </summary>
+    GameObject GetEquipmentPrefab();
+
+    /// <summary>
+    /// Get position offset for equipment placement.
+    /// </summary>
+    Vector3 GetPositionOffset();
+
+    /// <summary>
+    /// Get rotation offset for equipment placement.
+    /// </summary>
+    Vector3 GetRotationOffset();
+
+    /// <summary>
+    /// Get the name of the attachment point on the character.
+    /// </summary>
+    string GetAttachmentPointName();
+
+    /// <summary>
+    /// Find the attachment point transform on a user.
+    /// </summary>
+    Transform FindAttachmentPoint(GameObject user);
+}