refactor(worker): replace BackgroundService with Quartz IJob for scheduled execution

- Removed inheritance from BackgroundService
- Implemented Quartz IJob interface for better scheduling control
- Replaced ExecuteAsync with Execute(IJobExecutionContext)
- Updated cancellation handling to use context.CancellationToken

EnvelopeGenerator.Finalizer/Worker.cs

@@ -1,9 +1,10 @@
 using EnvelopeGenerator.Finalizer.Models;
 using Microsoft.Extensions.Options;
+using Quartz;
 
 namespace EnvelopeGenerator.Finalizer
 {
-    public class Worker : BackgroundService
+    public class Worker : IJob
     {
         private readonly ILogger<Worker> _logger;
 
@@ -15,16 +16,16 @@ namespace EnvelopeGenerator.Finalizer
             _options = workerOptions.Value;
         }
 
-        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        public async Task Execute(IJobExecutionContext context)
         {
-            while (!stoppingToken.IsCancellationRequested)
+            while (!context.CancellationToken.IsCancellationRequested)
             {
                 if (_logger.IsEnabled(LogLevel.Information))
                 {
                     _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
                 }
-                await Task.Delay(_options.IntervalInMillisecond, stoppingToken);
+                await Task.Delay(_options.IntervalInMillisecond, context.CancellationToken);
             }
         }
     }
-}
+}