chore: initial commit

Assets/Scripts/Core/Save/EmergencySaveService.cs

@@ -0,0 +1,51 @@
+using System.Threading.Tasks;
+using UnityEngine;
+using BaseGames.Core.Events;
+
+namespace BaseGames.Core.Save
+{
+    public class EmergencySaveService : MonoBehaviour
+    {
+        private const int EmergencySlot = 99;
+
+        [SerializeField] private float              _intervalSeconds = 120f;
+        [SerializeField] private SaveManager        _saveManager;
+        [SerializeField] private BoolEventChannelSO _onGameplayActive;
+
+        private bool  _gameplayActive;
+        private float _timer;
+
+        private void OnEnable()
+        {
+            if (_onGameplayActive != null) _onGameplayActive.OnEventRaised += OnGameplayActiveChanged;
+        }
+
+        private void OnDisable()
+        {
+            if (_onGameplayActive != null) _onGameplayActive.OnEventRaised -= OnGameplayActiveChanged;
+        }
+
+        private void OnGameplayActiveChanged(bool value) => _gameplayActive = value;
+
+        private void Update()
+        {
+            if (!_gameplayActive || _saveManager == null) return;
+            _timer += Time.deltaTime;
+            if (_timer >= _intervalSeconds)
+            {
+                _timer = 0f;
+                _ = _saveManager.SaveAsync(EmergencySlot);
+            }
+        }
+
+        public bool HasEmergencySave()
+            => _saveManager != null && _saveManager.SlotExists(EmergencySlot);
+
+        public async Task PromoteToSlot(int targetSlot)
+        {
+            if (_saveManager == null) return;
+            // Phase 1 stub：完整实现在 Phase 2 LocalFileStorage API
+            await Task.CompletedTask;
+        }
+    }
+}