feat(anomalies): sort the feed (newest / top score / longest gap)

Adds a sort chip row to the anomaly feed — newest (default), highest score, or
longest suspension gap — replacing the fixed newest-first order. DetectedAt is the
tiebreak so order stays stable.

- AnomalySort enum + AnomalyFilter.Sort (default Newest, so existing constructions
  are unaffected); AnomalyBrowsingService applies it; feed sort chips +
  SetSort/SortLabel; en/ru resx.
- 2 tests: default newest-first + highest-score ordering.

src/Marathon.UI/Services/AnomalyBrowsingService.cs

@@ -64,9 +64,17 @@ public sealed class AnomalyBrowsingService : IAnomalyBrowsingService
             filtered = filtered.Where(i => kinds.Contains(i.Kind));
         }
 
-        return filtered
-            .OrderByDescending(static i => i.DetectedAt)
-            .ToList();
+        // DetectedAt is the tiebreak for the score/gap sorts so order stays stable.
+        var sorted = filter.Sort switch
+        {
+            AnomalySort.HighestScore =>
+                filtered.OrderByDescending(i => i.Score).ThenByDescending(i => i.DetectedAt),
+            AnomalySort.LongestGap =>
+                filtered.OrderByDescending(i => i.SuspensionGapSeconds).ThenByDescending(i => i.DetectedAt),
+            _ => filtered.OrderByDescending(i => i.DetectedAt),
+        };
+
+        return sorted.ToList();
     }
 
     public async Task<AnomalyDetailVm?> GetByIdAsync(Guid id, CancellationToken ct)