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.DeploymentManager.Tests/DeploymentServiceTests.cs

@@ -41,8 +41,9 @@ public class DeploymentServiceTests
             OperationLockTimeout = TimeSpan.FromSeconds(5)
         });
 
+        var siteRepo = Substitute.For<ISiteRepository>();
         _service = new DeploymentService(
-            _repo, _pipeline, _comms, _lockManager, _audit, options,
+            _repo, siteRepo, _pipeline, _comms, _lockManager, _audit, options,
             NullLogger<DeploymentService>.Instance);
     }