feat: 部分修复Hdmi再次启动启动不了的bug

server/src/Services/HttpHdmiVideoStreamService.cs

@@ -119,7 +119,27 @@ public class HttpHdmiVideoStreamService : BackgroundService
     private async Task<HdmiIn?> GetOrCreateHdmiInAsync(string boardId)
     {
         if (_hdmiInDict.TryGetValue(boardId, out var hdmiIn))
+        {
+            try
+            {
+                var enableResult = await hdmiIn.EnableTrans(true);
+                if (!enableResult.IsSuccessful)
+                {
+                    logger.Error($"Failed to enable HDMI transmission for board {boardId}: {enableResult.Error}");
+                    return null;
+                }
+                logger.Info($"Successfully enabled HDMI transmission for board {boardId}");
+            }
+            catch (Exception ex)
+            {
+                logger.Error(ex, $"Exception occurred while enabling HDMI transmission for board {boardId}");
+                return null;
+            }
+
+            _hdmiInDict[boardId] = hdmiIn;
+            _hdmiInCtsDict[boardId] = new CancellationTokenSource();
             return hdmiIn;
+        }
 
         var db = new Database.AppDataConnection();
         if (db == null)