refactor(time): change DateTime from UTC to local time

- Change HealthCheckHtmlGenerator to use DateTime.Now instead of DateTime.UtcNow
- Change ProfileWorker health check timestamps to use DateTime.Now
- Change Program health check endpoint to use DateTime.Now
- Ensures consistent local time usage across the application

ECMJobRunner.WebCron/HealthCheck/HealthCheckHtmlGenerator.cs

@@ -112,7 +112,7 @@ public static class HealthCheckHtmlGenerator
                     <h1 class=""mb-2"">");
         sb.Append(icon);
         sb.Append($@" Health Check Status</h1>
-                    <p class=""text-muted mb-0"">Last checked: {DateTime.UtcNow:yyyy-MM-dd HH:mm:ss} UTC</p>
+                    <p class=""text-muted mb-0"">Last checked: {DateTime.Now:yyyy-MM-dd HH:mm:ss} UTC</p>
                 </div>
                 <div>
                     <h2><span class=""badge {badgeClass} fs-3"">{report.Status}</span></h2>