feat(TimeCountDown): 实现倒计时功能

Assets/Script/Gameplay/Global/GameCountdownManager.cs

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+using System;
+using Cysharp.Threading.Tasks;
+using UnityEngine;
+using UnityEngine.Events;
+using Core;
+
+namespace Script.Gameplay.Global
+{
+    /// <summary>
+    /// 全局关卡倒计时管理器（UniTimer 版）
+    /// </summary>
+    public sealed class GameCountdownManager : MonoSingleton<GameCountdownManager>
+    {
+
+        [Header("默认关卡时长（秒）")] [SerializeField] private float defaultDuration = 60f;
+
+        [Header("是否受 Time.timeScale 影响")] [SerializeField]
+        private bool useUnscaledTime = false;
+
+        [Header("事件：每秒刷新（剩余秒数）")] public UnityEvent<float> OnTick;
+
+        [Header("事件：倒计时结束")] public UnityEvent OnFinish;
+
+        private UniTimer _timer = new UniTimer();
+
+        /*------------------------------------------------------*/
+        protected override void Awake()
+        {
+            base.Awake();
+            // 确保事件实例化，避免其他脚本订阅时报 NullReferenceException
+            OnTick ??= new UnityEvent<float>();
+            OnFinish ??= new UnityEvent();
+        }
+
+        /// <summary>
+        /// 启动关卡倒计时（默认时长）
+        /// </summary>
+        public UniTask StartLevelTimer() => StartLevelTimer(defaultDuration);
+
+        /// <summary>
+        /// 启动关卡倒计时（指定时长）
+        /// </summary>
+        /// <param name="duration">秒</param>
+        public UniTask StartLevelTimer(float duration)
+        {
+            StopTimer(); // 先清掉旧计时器
+
+            // 用 unscaledDeltaTime 就不受 Time.timeScale 影响
+            Time.timeScale = 1f; // 可根据需求保留或去掉
+            return _timer.StartAsync(
+                duration,
+                isCountDown: true,
+                onTick: left => { OnTick?.Invoke(left); },
+                onComplete: () =>
+                {
+                    OnFinish?.Invoke();
+                    // 这里可以统一处理“时间到”逻辑
+                    TimeOutHandle();
+                });
+        }
+
+        /// <summary> 暂停 </summary>
+        public void Pause() => _timer.Pause();
+
+        /// <summary> 继续 </summary>
+        public void Resume() => _timer.Resume();
+
+        /// <summary> 立即结束并触发 OnFinish </summary>
+        public void StopTimer() => _timer.Stop();
+
+        /// <summary> 剩余时间（秒） </summary>
+        public float Remaining => _timer.Remaining;
+
+        /// <summary> 是否正在跑 </summary>
+        public bool IsRunning => _timer.IsRunning;
+
+        /*------------------------------------------------------*/
+        // 统一处理“时间到”
+        private void TimeOutHandle()
+        {
+            Debug.Log("[GameCountdown] 关卡时间到！");
+            // 可以在这里弹 UI、播放音效、加载结算场景等
+        }
+
+        /*------------------------------------------------------*/
+        // 方便外部 await 等待结束
+        public UniTask WaitForTimeOutAsync() => _timer.WaitForFinishAsync();
+    }
+}

Assets/Script/Gameplay/Global/GameCountdownManager.cs.meta

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+fileFormatVersion: 2
+guid: bdaad0392e5549f0ac761238b649cc70
+timeCreated: 1760751427

Assets/Script/Gameplay/Global/GameFlowManager.cs

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+using System;
+using Core;
+using UnityEngine;
+
+namespace Script.Gameplay.Global
+{
+    public enum GameState
+    {
+        Boot,        // 初始化
+        MainMenu,    // 主菜单
+        Playing,     // 游戏中
+        Paused,      // 暂停
+        GameOver,    // 游戏结束
+        Victory      // 胜利
+    }
+    
+    public class GameFlowManager : MonoSingleton<GameFlowManager>
+    {
+        private void Start()
+        {
+            GameCountdownManager.Instance.StartLevelTimer();
+        }
+    }
+}

Assets/Script/Gameplay/Global/GameFlowManager.cs.meta

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+fileFormatVersion: 2
+guid: 8ff98d4d16514d27a14dc271bbbd19e7
+timeCreated: 1760752445