feat(twitch): 新增離線提醒計時器與去抖動通知

- 在 `TwitchService.cs` 中，新增 `_streamOfflineReminders` 字典以管理離線提醒的計時器，並增加三分鐘的倒數計時器邏輯，改善用戶的通知體驗。此外，調整了直播開始的通知邏輯，確保移除舊的計時器並發送新的通知。

- 在 `DebounceChannelUpdateMessage.cs` 中，新增 `DebounceChannelUpdateMessage` 類別，使用去抖動技術管理 Twitch 頻道更新通知，減少不必要的通知，提升用戶體驗。

Author: konnokai

Discord Stream Notify Bot/SharedService/Twitch/Debounce/DebounceChannelUpdateMessage.cs

@@ -0,0 +1,83 @@
+using Discord_Stream_Notify_Bot.Interaction;
+using Dorssel.Utilities;
+using System.Collections.Concurrent;
+using static Discord_Stream_Notify_Bot.SharedService.Twitch.TwitchService;
+
+namespace Discord_Stream_Notify_Bot.SharedService.Twitch.Debounce
+{
+    // https://blog.darkthread.net/blog/dotnet-debounce/
+    // https://github.com/dorssel/dotnet-debounce
+    internal class DebounceChannelUpdateMessage
+    {
+        private readonly Debouncer _debouncer;
+        private readonly TwitchService _twitchService;
+        private readonly string _twitchUserName, _twitchUserLogin, _twitchUserId;
+        private readonly ConcurrentQueue<string> messageQueue = new();
+
+        public DebounceChannelUpdateMessage(TwitchService twitchService, string twitchUserName, string twitchUserLogin, string twitchUserId)
+        {
+            _twitchService = twitchService;
+            _twitchUserName = twitchUserName;
+            _twitchUserLogin = twitchUserLogin;
+            _twitchUserId = twitchUserId;
+
+            _debouncer = new()
+            {
+                DebounceWindow = TimeSpan.FromMinutes(1),
+                DebounceTimeout = TimeSpan.FromMinutes(3),
+            };
+            _debouncer.Debounced += _debouncer_Debounced;
+        }
+
+        private void _debouncer_Debounced(object sender, DebouncedEventArgs e)
+        {
+            try
+            {
+                Log.Info($"{_twitchUserLogin} 發送頻道更新通知 (Debouncer 觸發數量: {e.Count})");
+
+                var description = string.Join("\n\n", messageQueue);
+
+                var embedBuilder = new EmbedBuilder()
+                    .WithOkColor()
+                    .WithTitle($"{_twitchUserName} 直播資料更新")
+                    .WithUrl($"https://twitch.tv/{_twitchUserLogin}")
+                    .WithDescription(description);
+
+                using var db = Bot.DbService.GetDbContext();
+                var twitchSpider = db.TwitchSpider.AsNoTracking().FirstOrDefault((x) => x.UserId == _twitchUserId);
+                if (twitchSpider != null)
+                    embedBuilder.WithThumbnailUrl(twitchSpider.ProfileImageUrl);
+
+                Task.Run(async () => { await _twitchService.SendStreamMessageAsync(_twitchUserId, embedBuilder.Build(), NoticeType.ChangeStreamData); });
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex.Demystify(), $"{_twitchUserLogin} 訊息去抖動失敗");
+            }
+            finally
+            {
+                messageQueue.Clear();
+                _debouncer.Reset();
+            }
+        }
+
+        public void AddMessage(string message)
+        {
+            Log.Debug($"DebounceChannelUpdateMessage ({_twitchUserLogin}): {message}");
+
+            messageQueue.Enqueue(message);
+            _debouncer.Trigger();
+        }
+
+        bool isDisposed;
+        public void Dispose()
+        {
+            if (!isDisposed)
+            {
+                _debouncer.Debounced -= _debouncer_Debounced;
+                _debouncer.Dispose();
+                isDisposed = true;
+            }
+        }
+    }
+}