新增 Mjpegplayer 用来播放 Web 流

SHH.MjpegPlayer/Server/TaskManager.cs

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+using System.Collections.Concurrent;
+
+namespace SHH.MjpegPlayer;
+
+/// <summary>
+/// 任务状态信息载荷
+/// </summary>
+public record TaskMetadata(string Name, string Type, DateTime StartTime);
+
+/// <summary>
+/// 任务管理器：替代原 CoreTaskRun 功能
+/// 职责：记录运行中的异步任务，支持状态检索和统一取消
+/// </summary>
+public static class TaskManager
+{
+    // 存储运行中的任务及其元数据
+    public static readonly ConcurrentDictionary<string, TaskMetadata> RunningTasks = new();
+
+    // 存储取消令牌，用于停止特定任务
+    private static readonly ConcurrentDictionary<string, CancellationTokenSource> _tokens = new();
+
+    /// <summary>
+    /// 注册并运行一个受控任务
+    /// </summary>
+    public static void Run(string taskName, string taskType, Func<CancellationToken, Task> action)
+    {
+        var cts = new CancellationTokenSource();
+        _tokens[taskName] = cts;
+
+        var metadata = new TaskMetadata(taskName, taskType, DateTime.Now);
+        RunningTasks[taskName] = metadata;
+
+        // 启动异步任务
+        Task.Run(async () =>
+        {
+            try
+            {
+                await action(cts.Token);
+            }
+            finally
+            {
+                // Optimized: 任务结束（无论正常还是异常）必须清理资源
+                RunningTasks.TryRemove(taskName, out _);
+                _tokens.TryRemove(taskName, out _);
+            }
+        }, cts.Token);
+    }
+}