Add Rider launch profiles, fix DI and migrations for dev startup

- Rider launch profiles: "ScadaLink Central" and "ScadaLink Site"
- appsettings.Central.json: correct test_infra credentials (ScadaLink_Dev1#,
  scadalink_app user, GLAuth on 3893, Mailpit on 1025)
- Fix HealthMonitoring DI: split site vs central registration to avoid
  missing IHealthReportTransport on central
- Regenerate single clean EF migration (InitialSchema) covering all entities
- Suppress PendingModelChangesWarning in dev mode
- Fix isDevelopment check for ASPNETCORE_ENVIRONMENT propagation

Verified: Host starts, connects to SQL Server, applies migrations, boots
Akka.NET cluster, LDAP auth works (admin/password via GLAuth), health
endpoint returns Healthy.

src/ScadaLink.ConfigurationDatabase/ServiceCollectionExtensions.cs

@@ -16,7 +16,9 @@ public static class ServiceCollectionExtensions
     public static IServiceCollection AddConfigurationDatabase(this IServiceCollection services, string connectionString)
     {
         services.AddDbContext<ScadaLinkDbContext>(options =>
-            options.UseSqlServer(connectionString));
+            options.UseSqlServer(connectionString)
+                .ConfigureWarnings(w => w.Ignore(
+                    Microsoft.EntityFrameworkCore.Diagnostics.RelationalEventId.PendingModelChangesWarning)));
 
         services.AddScoped<ISecurityRepository, SecurityRepository>();
         services.AddScoped<ICentralUiRepository, CentralUiRepository>();