Phase 1 WP-11–22: Host infrastructure, Blazor Server UI, and integration tests

Host infrastructure (WP-11–17):
- StartupValidator with 19 validation rules
- /health/ready endpoint with DB + Akka health checks
- Akka.NET bootstrap via AkkaHostedService (HOCON config, cluster, remoting, SBR)
- Serilog with SiteId/NodeHostname/NodeRole enrichment
- DeadLetterMonitorActor with count tracking
- CoordinatedShutdown wiring (no Environment.Exit)
- Windows Service support (UseWindowsService)

Central UI (WP-18–21):
- Blazor Server shell with Bootstrap 5, role-aware NavMenu
- Login/logout flow (LDAP auth → JWT → HTTP-only cookie)
- CookieAuthenticationStateProvider with idle timeout
- LDAP group mapping CRUD page (Admin role)
- Route guards with Authorize attributes per role
- SignalR reconnection overlay for failover

Integration tests (WP-22):
- Startup validation, auth flow, audit transactions, readiness gating
186 tests pass (1 skipped: LDAP integration), zero warnings.

src/ScadaLink.Host/ScadaLink.Host.csproj

@@ -8,10 +8,18 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Akka.Cluster.Hosting" Version="1.5.62" />
+    <PackageReference Include="Akka.Hosting" Version="1.5.62" />
+    <PackageReference Include="Akka.Remote.Hosting" Version="1.5.62" />
+    <PackageReference Include="AspNetCore.HealthChecks.UI.Client" Version="9.0.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.5">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="10.0.5" />
+    <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="6.1.1" />
+    <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
   </ItemGroup>
 
   <ItemGroup>