Fix LDAP integration test: use GLAuth test credentials and runtime availability check

- Password "admin" → "password" (matches GLAuth config.toml)
- Replace hard Skip attribute with TCP connectivity check (test runs when GLAuth available)
- Add LdapSearchBase + AllowInsecureLdap to appsettings.Central.json for dev

src/ScadaLink.Host/appsettings.Central.json

@@ -24,6 +24,8 @@
       "LdapServer": "localhost",
       "LdapPort": 3893,
       "LdapUseTls": false,
+      "AllowInsecureLdap": true,
+      "LdapSearchBase": "dc=scadalink,dc=local",
       "JwtSigningKey": "CHANGE-ME-development-signing-key-at-least-32-chars",
       "JwtExpiryMinutes": 15,
       "IdleTimeoutMinutes": 30

tests/ScadaLink.IntegrationTests/AuthFlowTests.cs

@@ -103,10 +103,17 @@ public class AuthFlowTests : IClassFixture<ScadaLinkWebApplicationFactory>
     }
 
     [Trait("Category", "Integration")]
-    [Fact(Skip = "Requires running GLAuth LDAP server (Docker). Run with: docker compose -f infra/docker-compose.yml up -d glauth")]
+    [Fact]
     public async Task LoginEndpoint_WithValidLdapCredentials_SetsCookieAndRedirects()
     {
-        // This test requires the GLAuth test LDAP server running on localhost:3893
+        // Requires GLAuth test LDAP server: docker compose -f infra/docker-compose.yml up -d glauth
+        // GLAuth runs on localhost:3893, baseDN dc=scadalink,dc=local, all passwords "password"
+        if (!await IsLdapAvailableAsync())
+        {
+            // Skip gracefully if GLAuth not running — not a test failure
+            return;
+        }
+
         var client = _factory.CreateClient(new Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactoryClientOptions
         {
             AllowAutoRedirect = false
@@ -115,7 +122,7 @@ public class AuthFlowTests : IClassFixture<ScadaLinkWebApplicationFactory>
         var content = new FormUrlEncodedContent(new[]
         {
             new KeyValuePair<string, string>("username", "admin"),
-            new KeyValuePair<string, string>("password", "admin")
+            new KeyValuePair<string, string>("password", "password")
         });
 
         var response = await client.PostAsync("/auth/login", content);
@@ -129,4 +136,18 @@ public class AuthFlowTests : IClassFixture<ScadaLinkWebApplicationFactory>
         Assert.NotNull(setCookieHeader);
         Assert.Contains(CookieAuthenticationStateProvider.AuthCookieName, setCookieHeader);
     }
+
+    private static async Task<bool> IsLdapAvailableAsync()
+    {
+        try
+        {
+            using var tcp = new System.Net.Sockets.TcpClient();
+            await tcp.ConnectAsync("localhost", 3893).WaitAsync(TimeSpan.FromSeconds(2));
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
 }