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/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