fix(site-secrets): report every site node's secret mirror failures on the health report (M1)

A DeployedSecretsMirror failure on the STANDBY node (e.g. a master-key mismatch
that stops a deployed secret decrypting there) was only logged on that node:
site health reports are sent by the active node only, so central never saw it.

- New 12th LocalDb-replicated table secret_mirror_status (node_name PK,
  failures_json of {SecretName, Message}, checked_at; no FKs). Each node's
  mirror writes only its own row, and only when its failure set changes plus
  once per start-up (every write replicates via CDC). Best-effort: a failed
  write is a Warning and is retried next pass. Node key = INodeIdentityProvider
  NodeName, falling back to the machine name.
- SecretMirrorStatusReporter (SiteRuntime, every node, 30 s) reads every row
  into ISiteHealthCollector.SetSecretMirrorStatuses -> additive nullable
  SiteHealthReport.SecretMirrorStatuses (null = no data).
- Wire: SiteHealthReportDto.secret_mirror_statuses = 33 (presence wrapper so
  null != empty); vendored CentralControl.cs regenerated; mapper both ways.
- Central UI Health card: 'Secret mirror failing' badge + compact per-node
  node / secret / message list.
- Tests: mirror status write-on-change/first-pass/failure isolation, storage
  round-trip, reporter/collector, DTO mapper round-trip incl. null/empty,
  bUnit, replicated-table set (twelve) + FK guard wording.

tests/ZB.MOM.WW.ScadaBridge.Host.Tests/SiteLocalDbReplicatedTableFkGuardTests.cs

@@ -15,8 +15,9 @@ namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
 /// <c>RegisterReplicated</c> time, which on a site node is a BOOT failure of the replicating
 /// pair. This test moves that discovery from the first replicated boot to the build: it walks
 /// the real site schema (every table <c>SiteLocalDbSetup.OnReady</c> creates) and asserts none
-/// of the eleven <see cref="SiteLocalDbSetup.ReplicatedTables"/> (incl. <c>deployed_secrets</c>,
-/// added for site-secrets artifact deploy) has such an inbound FK.
+/// of the twelve <see cref="SiteLocalDbSetup.ReplicatedTables"/> (incl. <c>deployed_secrets</c>,
+/// added for site-secrets artifact deploy, and <c>secret_mirror_status</c>, added by review
+/// finding M1) has such an inbound FK.
 /// </summary>
 /// <remarks>
 /// The schema is built with an UNREPLICATED config on purpose: a replicated one would make