fix(save): 快照捕获增加管理器单例空值保护

Assets/Scripts/SaveSystem/Providers/ActorSnapshotProvider.cs

@@ -1,4 +1,5 @@
 using System.Collections;
+using UnityEngine;
 
 namespace AibisDream.SaveSystem
 {
@@ -13,6 +14,12 @@ namespace AibisDream.SaveSystem
 
         public object Capture()
         {
+            if (ActorManager.Instance == null)
+            {
+                Debug.LogWarning("[ActorSnapshotProvider] ActorManager 未初始化，跳过捕获。");
+                return null;
+            }
+
             return ActorManager.Instance.CaptureSnapshot();
         }
 

Assets/Scripts/SaveSystem/Providers/AudioSnapshotProvider.cs

@@ -1,5 +1,6 @@
 using System.Collections;
 using AibisDream.Kit;
+using UnityEngine;
 
 namespace AibisDream.SaveSystem
 {
@@ -14,6 +15,12 @@ namespace AibisDream.SaveSystem
 
         public object Capture()
         {
+            if (AudioManager.Instance == null)
+            {
+                Debug.LogWarning("[AudioSnapshotProvider] AudioManager 未初始化，跳过捕获。");
+                return null;
+            }
+
             return AudioManager.Instance.CaptureSnapshot();
         }
 

Assets/Scripts/SaveSystem/Providers/EnvironmentSnapshotProvider.cs

@@ -1,4 +1,5 @@
 using System.Collections;
+using UnityEngine;
 
 namespace AibisDream.SaveSystem
 {
@@ -13,6 +14,12 @@ namespace AibisDream.SaveSystem
 
         public object Capture()
         {
+            if (EnvironmentManager.Instance == null)
+            {
+                Debug.LogWarning("[EnvironmentSnapshotProvider] EnvironmentManager 未初始化，跳过捕获。");
+                return null;
+            }
+
             return EnvironmentManager.Instance.CaptureSnapshot();
         }
 

Assets/Scripts/SaveSystem/Providers/TimelineSnapshotProvider.cs

@@ -1,4 +1,5 @@
-using System.Collections;
+using System.Collections;
+using UnityEngine;
 
 namespace AibisDream.SaveSystem
 {
@@ -13,6 +14,12 @@ namespace AibisDream.SaveSystem
 
         public object Capture()
         {
+            if (TimelineCenter.Instance == null)
+            {
+                Debug.LogWarning("[TimelineSnapshotProvider] TimelineCenter 未初始化，跳过捕获。");
+                return null;
+            }
+
             return TimelineCenter.Instance.CaptureSnapshot();
         }