feat: Add ProfileManager for automatic Hangfire job scheduling

- Create ProfileManager background service that polls database every 1 second
- Query active profiles with cron schedules via MediatR GetProfileQuery
- Auto-create/update Hangfire recurring jobs using IRecurringJobManager
- Jobs execute TriggeringDEXJobBatchCommand via IMediator dependency injection
- Add profile caching with schedule change detection to avoid redundant updates
- Create DtoExtensions with JobId() and ToJob() helper methods for profile-to-command conversion

ECMJobRunner.WebCron/Extensions/DtoExtensions.cs

@@ -0,0 +1,21 @@
+using ECMJobRunner.Application.Common.Dtos;
+using ECMJobRunner.Application.DEXJob.Commands;
+using MediatR;
+
+namespace ECMJobRunner.WebCron.Extensions;
+
+public static class DtoExtensions
+{
+    public static string JobId(this CfgProfileDto profile)
+    {
+        return $"profile-{profile.Id}-{profile.ProfileName.Replace(' ', '_').ToLowerInvariant()}";
+    }
+
+    public static TriggeringDEXJobBatchCommand ToJob(this CfgProfileDto profile)
+    {
+        return new TriggeringDEXJobBatchCommand
+        {
+            ProfileId = profile.Id,
+        };
+    }
+}