feat(home): surface forward-test P&L on the dashboard

Adds a forward-test (paper-trading) net-P&L tile to the Home dashboard, shown only
once the worker has opened or settled any paper bet. Reuses the existing
IPaperTradingService aggregation (settled-only net + open count) so there is one
definition of the figure, and makes the H4 forward-test result visible from the
landing page instead of only its own route.

- DashboardSummary gains Paper{OpenCount,SettledCount,NetProfit,RoiPercent}
  (default-valued, so existing constructions are unaffected) + HasPaperTrades;
  DashboardSummaryService injects IPaperTradingService; Home tile + en/ru resx.

src/Marathon.UI/Pages/Home.razor

@@ -24,6 +24,10 @@
                   Delta="@AnomaliesDelta"
                   Anomaly="true" />
         <StatCard Label="@L["Home.Stat.Coverage"]" Value="@_summary.SportsCovered.ToString()" />
+        @if (_summary.HasPaperTrades)
+        {
+            <StatCard Label="@L["Home.Stat.ForwardPnl"]" Value="@PaperNet" Delta="@PaperDelta" />
+        }
     </div>
 
     <div class="m-grid--asym m-rise m-rise-3" style="margin-top: var(--m-space-6);">
@@ -114,6 +118,22 @@
         ? string.Format(CultureInfo.CurrentCulture, L["Home.Stat.NewToday"], _summary.AnomaliesToday)
         : null;
 
+    // Forward-test headline: settled-only net P&L, with open-bet count as the delta line.
+    private string PaperNet
+    {
+        get
+        {
+            if (_summary.PaperSettledCount == 0) return "—";
+            var v = _summary.PaperNetProfit;
+            var sign = v > 0m ? "+" : (v < 0m ? "-" : "");
+            return sign + Math.Abs(v).ToString("0.00", CultureInfo.InvariantCulture);
+        }
+    }
+
+    private string? PaperDelta => _summary.PaperOpenCount > 0
+        ? string.Format(CultureInfo.CurrentCulture, L["Home.Stat.ForwardOpen"], _summary.PaperOpenCount)
+        : null;
+
     protected override async Task OnInitializedAsync()
     {
         try

src/Marathon.UI/Resources/SharedResource.en.resx

@@ -74,6 +74,8 @@
   <data name="Home.Stat.Snapshots"><value>Snapshots today</value></data>
   <data name="Home.Stat.Anomalies"><value>Anomalies flagged</value></data>
   <data name="Home.Stat.Coverage"><value>Sports covered</value></data>
+  <data name="Home.Stat.ForwardPnl"><value>Forward-test P&amp;L</value></data>
+  <data name="Home.Stat.ForwardOpen"><value>{0} open</value></data>
   <data name="Home.Section.Latest"><value>Latest signals</value></data>
   <data name="Home.Section.Pipeline"><value>Capture pipeline</value></data>
   <data name="Home.Pipeline.Step1"><value>Schedule capture (`/su`)</value></data>

src/Marathon.UI/Resources/SharedResource.ru.resx

@@ -77,6 +77,8 @@
   <data name="Home.Stat.Snapshots"><value>Снимков сегодня</value></data>
   <data name="Home.Stat.Anomalies"><value>Аномалий найдено</value></data>
   <data name="Home.Stat.Coverage"><value>Видов спорта</value></data>
+  <data name="Home.Stat.ForwardPnl"><value>P&amp;L форвард-теста</value></data>
+  <data name="Home.Stat.ForwardOpen"><value>{0} открытых</value></data>
   <data name="Home.Section.Latest"><value>Свежий поток</value></data>
   <data name="Home.Section.Pipeline"><value>Конвейер сбора</value></data>
   <data name="Home.Pipeline.Step1"><value>Сбор расписания (`/su`)</value></data>

src/Marathon.UI/Services/DashboardSummaryService.cs

@@ -18,6 +18,7 @@ public sealed class DashboardSummaryService : IDashboardSummaryService
     private readonly ISnapshotRepository _snapshots;
     private readonly IAnomalyRepository _anomalies;
     private readonly IAnomalyBrowsingService _anomalyBrowsing;
+    private readonly IPaperTradingService _paperTrading;
     private readonly IOptionsMonitor<WorkerOptions> _workers;
 
     public DashboardSummaryService(
@@ -25,12 +26,14 @@ public sealed class DashboardSummaryService : IDashboardSummaryService
         ISnapshotRepository snapshots,
         IAnomalyRepository anomalies,
         IAnomalyBrowsingService anomalyBrowsing,
+        IPaperTradingService paperTrading,
         IOptionsMonitor<WorkerOptions> workers)
     {
         _events = events ?? throw new ArgumentNullException(nameof(events));
         _snapshots = snapshots ?? throw new ArgumentNullException(nameof(snapshots));
         _anomalies = anomalies ?? throw new ArgumentNullException(nameof(anomalies));
         _anomalyBrowsing = anomalyBrowsing ?? throw new ArgumentNullException(nameof(anomalyBrowsing));
+        _paperTrading = paperTrading ?? throw new ArgumentNullException(nameof(paperTrading));
         _workers = workers ?? throw new ArgumentNullException(nameof(workers));
     }
 
@@ -54,6 +57,9 @@ public sealed class DashboardSummaryService : IDashboardSummaryService
 
         var w = _workers.CurrentValue;
 
+        // Reuse the forward-test aggregation (settled-only P&L) for the headline tile.
+        var paper = await _paperTrading.GetAsync(ct).ConfigureAwait(false);
+
         return new DashboardSummary(
             EventsTracked: eventsTracked,
             SnapshotsToday: snapshotsToday,
@@ -64,7 +70,11 @@ public sealed class DashboardSummaryService : IDashboardSummaryService
             ScheduleStatus: StageStatus(w.UpcomingPollerEnabled, eventsTracked > 0),
             SnapshotStatus: StageStatus(w.LivePollerEnabled, snapshotsToday > 0),
             DetectorStatus: StageStatus(w.AnomalyDetectionEnabled, anomaliesTotal > 0),
-            ExportStatus: eventsTracked > 0 ? "ok" : "idle");
+            ExportStatus: eventsTracked > 0 ? "ok" : "idle",
+            PaperOpenCount: paper.OpenCount,
+            PaperSettledCount: paper.SettledCount,
+            PaperNetProfit: paper.NetProfit,
+            PaperRoiPercent: paper.RoiPercent);
     }
 
     // Maps a worker stage to the PipelineStep token: disabled → idle, enabled but

src/Marathon.UI/Services/IDashboardSummaryService.cs

@@ -25,8 +25,15 @@ public sealed record DashboardSummary(
     string ScheduleStatus,
     string SnapshotStatus,
     string DetectorStatus,
-    string ExportStatus)
+    string ExportStatus,
+    int PaperOpenCount = 0,
+    int PaperSettledCount = 0,
+    decimal PaperNetProfit = 0m,
+    decimal? PaperRoiPercent = null)
 {
+    /// <summary>True once the forward-test worker has opened or settled any paper bet.</summary>
+    public bool HasPaperTrades => PaperOpenCount > 0 || PaperSettledCount > 0;
+
     /// <summary>True once anything has been captured — gates the welcome/empty state.</summary>
     public bool HasAnyData => EventsTracked > 0 || AnomaliesTotal > 0;