fix(web): calculate correct Hangfire job StartedAt using TotalDuration metadata

src/dotnet/QuantEngine.Web/Pages/Admin/Operations/Index.cshtml

@@ -68,7 +68,7 @@
                                             }
                                         </td>
                                         <td>
-                                            <form method="post" asp-page-handler="TriggerJob" class="d-inline">
+                                            <form method="post" action="/Admin/Operations?handler=TriggerJob" class="d-inline">
                                                 @Html.AntiForgeryToken()
                                                 <input type="hidden" name="jobId" value="@job.JobId" />
                                                 <button type="submit" class="btn btn-sm btn-success text-white">즉시 실행</button>

src/dotnet/QuantEngine.Web/Pages/Admin/Operations/Index.cshtml.cs

@@ -87,18 +87,26 @@ public class IndexModel : PageModel
             InactiveJobsCount = TotalJobsCount - ActiveJobsCount;
 
             var succeeded = monitoringApi.SucceededJobs(0, 10)
-                .Select(kv => new JobExecutionInfo(
-                    kv.Value.Job?.Method.Name ?? kv.Key,
-                    kv.Value.SucceededAt ?? DateTime.UtcNow,
-                    kv.Value.SucceededAt,
-                    true));
+                .Select(kv => {
+                    var succeededAt = kv.Value.SucceededAt ?? DateTime.UtcNow;
+                    var durationMs = kv.Value.TotalDuration ?? 0;
+                    var startedAt = succeededAt.AddMilliseconds(-durationMs);
+                    return new JobExecutionInfo(
+                        kv.Value.Job?.Method.Name ?? kv.Key,
+                        startedAt,
+                        succeededAt,
+                        true);
+                });
 
             var failed = monitoringApi.FailedJobs(0, 10)
-                .Select(kv => new JobExecutionInfo(
-                    kv.Value.Job?.Method.Name ?? kv.Key,
-                    kv.Value.FailedAt ?? DateTime.UtcNow,
-                    kv.Value.FailedAt,
-                    false));
+                .Select(kv => {
+                    var failedAt = kv.Value.FailedAt ?? DateTime.UtcNow;
+                    return new JobExecutionInfo(
+                        kv.Value.Job?.Method.Name ?? kv.Key,
+                        failedAt,
+                        failedAt,
+                        false);
+                });
 
             RecentExecutions = succeeded.Concat(failed)
                 .OrderByDescending(e => e.StartedAt)