多轮审查和修复

Assets/Scripts/Support/Platform/PlatformBootstrap.cs

@@ -0,0 +1,42 @@
+using UnityEngine;
+using BaseGames.Core;
+
+namespace BaseGames.Platform
+{
+    /// <summary>
+    /// 平台服务引导组件（架构 16_SupportingModules §3.1）。
+    /// 在场景加载最早阶段（DefaultExecutionOrder = -200）检测平台并向 ServiceLocator 注入实现。
+    /// ⚠️ 使用 PlatformBootstrap MonoBehaviour + ServiceLocator 模式，非静态 PlatformManager。
+    /// </summary>
+    [DefaultExecutionOrder(-200)]
+    public class PlatformBootstrap : MonoBehaviour
+    {
+        private IPlatformService _platform;
+
+        private async void Awake()
+        {
+            IPlatformService service;
+
+#if UNITY_STANDALONE && STEAMWORKS_NET
+            service = new SteamPlatformService();
+#else
+            service = new NullPlatformService();
+#endif
+
+            bool ok = await service.InitializeAsync();
+            if (!ok)
+            {
+                Debug.LogWarning("[PlatformBootstrap] 平台服务初始化失败，退回到 NullPlatformService。");
+                service = new NullPlatformService();
+            }
+
+            ServiceLocator.Register<IPlatformService>(service);
+            _platform = service;
+            Debug.Log($"[PlatformBootstrap] 已注册 {service.GetType().Name}。");
+        }
+
+        private void Update() => _platform?.RunCallbacks();
+
+        private void OnApplicationQuit() => _platform?.Shutdown();
+    }
+}