Refactor Worker to use IOptions for configuration

Replaced direct IConfiguration usage in Worker with IOptions<WorkerOptions> for strongly-typed configuration access. Updated delay interval assignment and added necessary namespace import.

EnvelopeGenerator.ServiceHost/Worker.cs

@@ -1,4 +1,5 @@
 using EnvelopeGenerator.ServiceHost.Jobs;
+using Microsoft.Extensions.Options;
 
 namespace EnvelopeGenerator.ServiceHost;
 
@@ -8,10 +9,10 @@ public class Worker : BackgroundService
     private readonly int _delayMilliseconds;
     private readonly IServiceScopeFactory _scopeFactory;
 
-    public Worker(ILogger<Worker> logger, IConfiguration configuration, IServiceScopeFactory scopeFactory)
+    public Worker(ILogger<Worker> logger, IOptions<WorkerOptions> options, IServiceScopeFactory scopeFactory)
     {
         _logger = logger;
-        _delayMilliseconds = Math.Max(1, configuration.GetValue("Worker:DelayMilliseconds", 1000));
+        _delayMilliseconds = options.Value.DelayMilliseconds;
         _scopeFactory = scopeFactory;
     }