feat(adminui): F15.3 closes F15 — live alerts/script-log, CSV import, Monaco editor

Final F15 batch wires up the SignalR-backed live pages, ports the bulk
equipment importer, and progressively enhances the Script source editor
with Monaco.

Message contracts:
- Commons.Messages.Alerts.AlarmTransitionEvent — fires on every alarm
  state transition; published on the `alerts` DPS topic by future
  ScriptedAlarmActor (F9) emits.
- Commons.Messages.Logging.ScriptLogEntry — one log line emitted by a
  hosted script; published on the `script-logs` DPS topic by future
  VirtualTagActor (F8) + ScriptedAlarmActor (F9) emits.
  (Folder named "Logging" to dodge .gitignore's "logs/" rule.)

SignalR plumbing:
- AlertHub gains MethodName + bridge actor (AlertSignalRBridge)
- ScriptLogHub introduced; ScriptLogSignalRBridge follows the same
  DPS-subscribe → IHubContext fan-out pattern as FleetStatusSignalRBridge
- WithOtOpcUaSignalRBridges now spawns all three bridges
- MapOtOpcUaHubs maps /hubs/script-log alongside the existing hubs

Pages:
- /alerts                      live alarm tail, 200-row capacity
- /script-log                  live script-log tail with level + script
                               filter, 500-row capacity
- /clusters/{id}/equipment/import — CSV bulk Equipment add with preview
                                    (Name/MachineCode/UnsLineId/Driver +
                                    optional ZTag/SAPID/Manufacturer/Model;
                                    skips rows whose MachineCode already
                                    exists in the fleet)
- ScriptEdit progressively enhanced with Monaco editor via JSInterop —
  the textarea remains Blazor's source of truth and Monaco syncs into it
  on every keystroke so @bind keeps working; falls back gracefully if
  the CDN is unreachable.

MainLayout nav gains a "Live" section (Deployments, Alerts, Alarms
historian) and a "Scripts" link under Scripting. ClusterEquipment
surfaces the new Import CSV button.

Tally: F15 ships ~42 razor pages + 3 SignalR hubs + 3 bridge actors.
Microsoft.AspNetCore.SignalR.Client added (was already in central PM).

All 104 v2 tests remain green.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Layout/MainLayout.razor

@@ -46,8 +46,14 @@
             <div class="rail-eyebrow">Scripting</div>
             <NavLink class="rail-link" href="/virtual-tags" Match="NavLinkMatch.Prefix">Virtual tags</NavLink>
             <NavLink class="rail-link" href="/scripted-alarms" Match="NavLinkMatch.Prefix">Scripted alarms</NavLink>
+            <NavLink class="rail-link" href="/scripts" Match="NavLinkMatch.Prefix">Scripts</NavLink>
             <NavLink class="rail-link" href="/script-log" Match="NavLinkMatch.Prefix">Script log</NavLink>
 
+            <div class="rail-eyebrow">Live</div>
+            <NavLink class="rail-link" href="/deployments" Match="NavLinkMatch.Prefix">Deployments</NavLink>
+            <NavLink class="rail-link" href="/alerts" Match="NavLinkMatch.Prefix">Alerts</NavLink>
+            <NavLink class="rail-link" href="/alarms-historian" Match="NavLinkMatch.Prefix">Alarms historian</NavLink>
+
             <div class="rail-foot">
                 <AuthorizeView>
                     <Authorized>