style(ui): align admin styling with ScadaLink master conventions

- Move CSS into wwwroot/css/ (theme.css, site.css); sidebar 218 -> 220px
- Add hamburger + Bootstrap collapse for <lg viewports
- Add Components/Shared/ with LoadingSpinner, ToastNotification, StatusBadge
- Replace .page-title with flex + <h4 class="mb-0"> across 20 pages
- Convert NewCluster + IdentificationFields forms to card + h6 subsection pattern

src/Server/ZB.MOM.WW.OtOpcUa.Admin/Components/Pages/Drivers/FocasDetail.razor

@@ -3,7 +3,9 @@
 @using ZB.MOM.WW.OtOpcUa.Admin.Services
 @inject FocasDriverDetailService DetailSvc
 
-<h1 class="page-title">FOCAS driver <span class="mono">@InstanceId</span></h1>
+<div class="d-flex justify-content-between align-items-center mb-3">
+    <h4 class="mb-0">FOCAS driver <span class="mono">@InstanceId</span></h4>
+</div>
 
 @if (_loading)
 {