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.

src/ScadaLink.CentralUI/Components/Pages/Login.razor

@@ -12,7 +12,7 @@
                 <div class="alert alert-danger py-2" role="alert">@ErrorMessage</div>
             }
 
-            <form method="post" action="/auth/login">
+            <form method="post" action="/auth/login" data-enhance="false">
                 <div class="mb-3">
                     <label for="username" class="form-label">Username</label>
                     <input type="text" class="form-control" id="username" name="username"