feat(centralui): execution-chain tree view on the Audit Log page

src/ScadaLink.CentralUI/Services/AuditLogQueryService.cs

@@ -132,4 +132,23 @@ public sealed class AuditLogQueryService : IAuditLogQueryService
 
         return repoSnapshot with { BacklogTotal = backlog };
     }
+
+    /// <inheritdoc/>
+    public async Task<IReadOnlyList<ExecutionTreeNode>> GetExecutionTreeAsync(
+        Guid executionId,
+        CancellationToken ct = default)
+    {
+        // Test-seam ctor: use the injected repository directly.
+        if (_injectedRepository is not null)
+        {
+            return await _injectedRepository.GetExecutionTreeAsync(executionId, ct);
+        }
+
+        // Production: a fresh scope (and thus a fresh DbContext) per call — the
+        // same context-isolation contract QueryAsync upholds, so the tree
+        // page's auto-load never shares the circuit-scoped context.
+        await using var scope = _scopeFactory!.CreateAsyncScope();
+        var repository = scope.ServiceProvider.GetRequiredService<IAuditLogRepository>();
+        return await repository.GetExecutionTreeAsync(executionId, ct);
+    }
 }