docs(historian-gateway): document gateway backend, config keys, EnsureTags hook, known gates; retire Wonderware from docs

HistorianGateway is now the sole historian backend (read + alarm SendEvent +
continuous WriteLiveValues). Document the final state and retire the Wonderware
sidecar from the docs/config/labels:

- CLAUDE.md: rewrite the Historian section — ServerHistorian /
  ContinuousHistorization / AlarmHistorian config keys, the IHistorianProvisioning
  EnsureTags hook, the GatewayAlarmHistorianWriter SendEvent path + ReadEvents
  dependency on gateway RuntimeDb:EventReadsEnabled=true, gateway-side
  prerequisites (RuntimeDb flags + historian:read/write/tags:write scopes),
  migration note, and two KNOWN-LIMITATION callouts (live-validation gate +
  empty historized-ref-set recorder follow-on).
- appsettings.json: fix the stale ServerHistorian block (Host/Port/SharedSecret/
  ServerCertThumbprint -> Endpoint/ApiKey/UseTls/AllowUntrustedServerCertificate/
  CaCertificatePath/CallTimeout, keep MaxTieClusterOverfetch); add a disabled
  ContinuousHistorization block; prune the orphaned Wonderware keys from
  AlarmHistorian (keep the SQLite knobs). ApiKey env-supplied via
  ServerHistorian__ApiKey (commented; valid strict JSON via _comment keys).
- README.md + docs (Historian.md, AlarmHistorian.md, Configuration.md,
  ServiceHosting.md, DriverLifecycle.md, drivers/README.md, Uns.md, VirtualTags.md,
  AlarmTracking.md, Client.UI.md, README.md, TestConnectProbes.md): retire the
  Wonderware historian backend from current-backend descriptions; fix the stale
  ServerHistorian/AlarmHistorian config tables (now gateway shape); convert
  drivers/Historian.Wonderware.md to a retired stub pointing at the gateway.
- Source/UI labels (descriptive text only, no behavior change):
  OtOpcUaServerHostedService.cs, HistoryPaging.cs, OtOpcUaSdkServer.cs,
  HistorianAdapterActor.cs, VirtualTagModal.razor, ScriptedAlarmModal.razor,
  AlarmsHistorian.razor now name the HistorianGateway backend.

Build clean (0 errors); AdminUI.Tests green (514 passed).

Claude-Session: https://claude.ai/code/session_012SDSQ3AcaXqPcBtDESBRii

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/HistoryPaging.cs

@@ -40,7 +40,7 @@ internal sealed record HistoryContinuationState(
 
 /// <summary>
 ///     Pure server-side continuation-point paging decisions for the count-capped variable-history arms
-///     (Raw / Processed). The backend (Wonderware sidecar) does NOT page — it returns up to
+///     (Raw / Processed). The backend (the HistorianGateway read client) does NOT page — it returns up to
 ///     <c>NumValuesPerNode</c> samples with a null continuation point — so paging is synthesised here,
 ///     time-based:
 ///     <list type="bullet">

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaSdkServer.cs

@@ -85,7 +85,7 @@ public sealed class OtOpcUaSdkServer : StandardServer
     ///     Wire the server-side HistoryRead backend (the <see cref="IHistorianDataSource"/> the node
     ///     manager's HistoryRead overrides block-bridge to) onto the created
     ///     <see cref="OtOpcUaNodeManager"/>. The host calls this after start with the DI-resolved source —
-    ///     the <c>NullHistorianDataSource</c> default (GoodNoData-empty reads) or the configured Wonderware
+    ///     the <c>NullHistorianDataSource</c> default (GoodNoData-empty reads) or the configured HistorianGateway
     ///     read client. Passing <c>null</c> restores the Null default (the property setter null-coalesces),
     ///     i.e. "no historian". No-op (returns <c>false</c>) when the node manager has not been created yet,
     ///     so the caller can detect a too-early call (mirrors <see cref="SetNodeWriteGateway"/>).