feat: add cross-engine platform services

Runtime/MigrationChain.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using Newtonsoft.Json.Linq;
-using UnityEngine;
 
 namespace ShrinkDataSaver
 {
@@ -33,7 +32,7 @@ namespace ShrinkDataSaver
             {
                 if (!Migrations.TryGetValue(version, out var migration))
                 {
-                    Debug.LogWarning($"[ShrinkDataSaver] 未找到 v{version} → v{version + 1} 的迁移逻辑，数据可能不完整。");
+                    ShrinkDataSaverPlatform.Warning($"[ShrinkDataSaver] 未找到 v{version} → v{version + 1} 的迁移逻辑，数据可能不完整。");
                     break;
                 }
 
@@ -42,11 +41,11 @@ namespace ShrinkDataSaver
                     var fromV = version;
                     data = migration.Migrate(data) ?? data;
                     version = migration.ToVersion;
-                    Debug.Log($"[ShrinkDataSaver] 存档已迁移 v{fromV} → v{version}");
+                    ShrinkDataSaverPlatform.Info($"[ShrinkDataSaver] 存档已迁移 v{fromV} → v{version}");
                 }
                 catch (Exception e)
                 {
-                    Debug.LogError(
+                    ShrinkDataSaverPlatform.Error(
                         $"[ShrinkDataSaver] 迁移 v{version} → v{migration.ToVersion} 失败: {e.Message}，已回滚至 v{currentVersion}");
                     return (backup, currentVersion);
                 }
@@ -57,4 +56,4 @@ namespace ShrinkDataSaver
 
         internal static void Clear() => Migrations.Clear();
     }
-}
+}