存档重构，游戏内容解锁机制；教程完善（未完成）

Assets/Scripts/UI/ChapterSelection/ChapterSelectionUI.cs

@@ -24,6 +24,11 @@ namespace Ichni.UI
         public ChapterSelectionUnit connectedChapter;
 
         public string chapterName;
+        /// <summary>
+        /// 当前章节的运行时锁定状态。仅用于 UI 表现；真正进入剧情或选曲前仍会重新调用
+        /// <see cref="UnlockSaveModule.CanAccessChapter"/>，不能把本字段作为授权依据。
+        /// </summary>
+        public bool isLocked;
         public bool isExpanded;
         public bool isDuringAnimation;
 
@@ -59,6 +64,7 @@ namespace Ichni.UI
         {
             connectedChapter = chapter;
             expansionRipple.material = new Material(rippleMaterial);
+            RefreshUnlockState();
             
             expandButton.onClick.AddListener(() =>
             {
@@ -83,6 +89,11 @@ namespace Ichni.UI
                 {
                     return;
                 }
+
+                if (!CanEnterChapter())
+                {
+                    return;
+                }
                 
                 ChapterSelectionManager.instance.currentChapter = connectedChapter;
                 AudioManager.SetSwitch(connectedChapter.chapterSwitch);
@@ -97,6 +108,11 @@ namespace Ichni.UI
                 {
                     return;
                 }
+
+                if (!CanEnterChapter())
+                {
+                    return;
+                }
                 
                 ChapterSelectionManager.instance.currentChapter = connectedChapter;
                 AudioManager.SetSwitch(connectedChapter.chapterSwitch);
@@ -112,6 +128,36 @@ namespace Ichni.UI
             allPerfectText.text = allPerfectCount.ToString();
             beatmapProgressText.text = $"{finishedBeatmapCount}/{beatmapCount}";
         }
+
+        /// <summary>
+        /// 根据统一内容解锁服务刷新章节入口的可交互状态。
+        /// 当前 Prefab 尚无专用锁定美术，因此先禁用两个实际入口；后续补充锁图标时，
+        /// 只需读取 <see cref="isLocked"/>，无需复制解锁判断。
+        /// </summary>
+        private void RefreshUnlockState()
+        {
+            UnlockSaveModule unlockSaveModule = GameSaveManager.instance?.UnlockSaveModule;
+            isLocked = unlockSaveModule == null || !unlockSaveModule.CanAccessChapter(connectedChapter);
+
+            if (enterStorylineButton != null)
+            {
+                enterStorylineButton.interactable = !isLocked;
+            }
+
+            if (enterSongSelectionButton != null)
+            {
+                enterSongSelectionButton.interactable = !isLocked;
+            }
+        }
+
+        /// <summary>
+        /// 章节的最终入口检查。即使 UI Button 状态被其它脚本意外恢复，也不能绕过解锁规则。
+        /// </summary>
+        private bool CanEnterChapter()
+        {
+            RefreshUnlockState();
+            return !isLocked;
+        }
         
         private void Expand()
         {
@@ -197,4 +243,4 @@ namespace Ichni.UI
             shrinkSequence.Play();
         }
     }
-}
+}