feat(health): show site event-log/audit write and redaction failures on the Health dashboard (ScadaBridge#88)

New SiteWriteFailureBadges component renders warning badges for
SiteEventLogWriteFailures, SiteAuditWriteFailures and AuditRedactionFailure
when > 0 on online sites. The CLI 'health summary' already serialises the full
latest report, so these counters are visible there unchanged.

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Health/SiteWriteFailureBadges.razor

@@ -0,0 +1,42 @@
+@using ZB.MOM.WW.ScadaBridge.Commons.Messages.Health
+
+@* Gitea #88: warning badges for the three site-report failure counters that were collected
+   and shipped to central but never rendered — event-log write failures (cumulative since the
+   logger started), audit write failures (per-interval) and audit redaction failures
+   (per-interval). Each renders only when its counter is > 0, like the "Audit rows rejected"
+   badge (#69). Offline sites render nothing: the Offline badge is the signal that matters. *@
+@if (Report is not null && IsOnline)
+{
+    @if (Report.SiteEventLogWriteFailures > 0)
+    {
+        <span class="badge bg-warning text-dark"
+              data-test="event-log-write-failures-badge"
+              title="The site failed to write @Report.SiteEventLogWriteFailures event-log row(s) since its logger started (SQLite error, disk full, or queue overflow). Site events are being lost — check the site node's disk and logs.">
+            Event log write failures
+        </span>
+    }
+    @if (Report.SiteAuditWriteFailures > 0)
+    {
+        <span class="badge bg-warning text-dark"
+              data-test="audit-write-failures-badge"
+              title="The site's primary audit writer failed @Report.SiteAuditWriteFailures time(s) in the last report interval; rows were routed to the drop-oldest fallback ring and may be lost. Check the site's audit SQLite store.">
+            Audit write failures
+        </span>
+    }
+    @if (Report.AuditRedactionFailure > 0)
+    {
+        <span class="badge bg-warning text-dark"
+              data-test="audit-redaction-failures-badge"
+              title="The audit payload redactor errored @Report.AuditRedactionFailure time(s) in the last report interval and fields were replaced with a redaction-error marker. Check the audit redaction regex configuration.">
+            Audit redaction failures
+        </span>
+    }
+}
+
+@code {
+    /// <summary>The site's latest health report, or null when none has arrived yet.</summary>
+    [Parameter] public SiteHealthReport? Report { get; set; }
+
+    /// <summary>Whether the site is currently online; offline sites show no warning badges.</summary>
+    [Parameter] public bool IsOnline { get; set; }
+}

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Monitoring/Health.razor

@@ -293,6 +293,7 @@
                                     Audit rows rejected
                                 </span>
                             }
+                            <SiteWriteFailureBadges Report="@state.LatestReport" IsOnline="@state.IsOnline" />
                             @if (!state.IsOnline && state.LastStatusChangeAt is { } changedAt)
                             {
                                 <small class="text-muted">offline since @changedAt.ToString("u")</small>