feat(insights): anomaly outcome validator — hit-rate calibration page

Adds a calibration dashboard that joins persisted SuspensionFlip anomalies
with EventResult rows and reports whether the post-flip favourite actually
won — the single metric that says whether the detector is doing its job.

Domain:
- AnomalyEvidenceData + AnomalyEvidenceParser to read the JSON written by
  AnomalyDetector without re-implementing the schema.
- AnomalyOutcomeEvaluator: pure function returning Hit / Miss / Unresolved.
  Tennis-style two-way markets with a Draw winner are downgraded to
  Unresolved rather than silently counted as Miss.
- AnomalySeverityThresholds: shared Low/Medium/High constants so the UI
  badge and the report buckets cannot drift.

Application:
- EvaluateAnomalyOutcomesUseCase orchestrates the join + aggregation.
- AnomalyOutcomeReport carries totals, hit rate, three breakdowns
  (severity / sport / score bins) and a per-event title lookup so the UI
  needs no second pass over IEventRepository.
- Score bins extend below 0.30 automatically when the operator lowers the
  detector threshold so the histogram total always equals ResolvedCount.

UI:
- Insights page at /anomalies/insights — hero header, 4-card KPI strip
  (hit rate tinted by tone), three breakdown grids with bar visualisation,
  drill-down tables for resolved and unresolved anomalies. Honors
  prefers-reduced-motion. RU + EN localisation.
- Nav entry under Analysis section + chip button on the Anomaly Feed.

Tests: +42 across Domain + Application (evaluator boundary cases including
tennis two-way and Draw guard, score-bin edges, dynamic floor when
threshold is lowered, event-title pass-through). All 324 tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Marathon.UI/Pages/Anomalies/AnomalyFeed.razor

@@ -98,6 +98,9 @@
             <button type="button" class="m-chip" @onclick="MarkAllRead" data-test="mark-read">
                 @L["Anomaly.Filter.MarkRead"]
             </button>
+            <button type="button" class="m-chip" @onclick="OpenInsights" data-test="open-insights">
+                @L["Nav.Insights"]
+            </button>
         </div>
     </div>
 
@@ -269,6 +272,11 @@
         State.MarkAllSeen(DateTimeOffset.UtcNow);
     }
 
+    private void OpenInsights()
+    {
+        Nav.NavigateTo("/anomalies/insights");
+    }
+
     private void HandleClick(AnomalyListItem item)
     {
         Nav.NavigateTo($"/anomalies/{item.Id}");