fix util-crontab name

Author: Haiping Chen

src/Infrastructure/BotSharp.Core.Crontab/Functions/ScheduleTaskFn.cs

@@ -1,11 +1,12 @@
 using BotSharp.Abstraction.Routing;
 using BotSharp.Abstraction.Users;
+using BotSharp.Core.Crontab.Hooks;
 
 namespace BotSharp.Core.Crontab.Functions;
 
 public class ScheduleTaskFn : IFunctionCallback
 {
-    public string Name => "schedule_task";
+    public string Name => $"{CrontabUtilityHook.PREFIX}schedule_task";
     private readonly IServiceProvider _services;
 
     public ScheduleTaskFn(IServiceProvider services)

src/Infrastructure/BotSharp.Core.Crontab/Hooks/CrontabUtilityHook.cs

@@ -5,7 +5,7 @@ namespace BotSharp.Core.Crontab.Hooks;
 
 public class CrontabUtilityHook : IAgentUtilityHook
 {
-    private const string PREFIX = "util-crontab-";
+    public const string PREFIX = "util-crontab-";
     private const string SCHEDULE_TASK_FN = $"{PREFIX}schedule_task";
 
     public void AddUtilities(List<AgentUtility> utilities)