Fix auth, Bootstrap, Blazor nav, LDAP, and deployment pipeline for working Central UI

Bootstrap served locally with absolute paths and <base href="/">.
LDAP auth uses search-then-bind with service account for GLAuth compatibility.
CookieAuthenticationStateProvider reads HttpContext.User instead of parsing JWT.
Login/logout forms opt out of Blazor enhanced nav (data-enhance="false").
Nav links use absolute paths; seed data includes Design/Deployment group mappings.
DataConnections page loads all connections (not just site-assigned).
Site appsettings configured for Test Plant A; Site registers with Central on startup.
DeploymentService resolves string site identifier for Akka routing.
Instances page gains Create Instance form.

tests/ScadaLink.IntegrationTests/AuthFlowTests.cs

@@ -134,7 +134,7 @@ public class AuthFlowTests : IClassFixture<ScadaLinkWebApplicationFactory>
         // Verify auth cookie was set
         var setCookieHeader = response.Headers.GetValues("Set-Cookie").FirstOrDefault();
         Assert.NotNull(setCookieHeader);
-        Assert.Contains(CookieAuthenticationStateProvider.AuthCookieName, setCookieHeader);
+        Assert.Contains("ScadaLink.Auth", setCookieHeader);
     }
 
     private static async Task<bool> IsLdapAvailableAsync()