fix(LauncherOptions): 修改HttpPort默认值为8080

将HttpPort的DefaultValue属性从28080改为8080，使其更符合常用HTTP端口标准

Author: AlianBlank

GameFrameX.StartUp/Options/LauncherOptions.cs

@@ -308,8 +308,7 @@ public sealed class LauncherOptions
     /// <summary>
     /// HTTP 端口
     /// </summary>
-    [Option(nameof(HttpPort), Description = "HTTP 端口")]
-    [DefaultValue(28080)]
+    [Option(nameof(HttpPort), DefaultValue = 8080, Description = "HTTP 端口")]
     public ushort HttpPort { get; set; }
 
     /// <summary>