Add auto redirect to provider to launcher

LANCommander.Launcher/ViewModels/LoginViewModel.cs

@@ -52,6 +52,9 @@ public partial class LoginViewModel : ViewModelBase
     [ObservableProperty]
     private bool _isServerOffline;
 
+    [ObservableProperty]
+    private bool _autoRedirectToProvider;
+
     public ObservableCollection<AuthenticationProvider> AuthenticationProviders { get; } = new();
 
     public event EventHandler? LoginSucceeded;
@@ -94,6 +97,18 @@ public partial class LoginViewModel : ViewModelBase
 
         if (!AllowRegistration && IsRegistering)
             IsRegistering = false;
+
+        AutoRedirectToProvider = await _authenticationClient.GetAutoRedirectToProviderAsync();
+    }
+
+    public async Task TryAutoRedirectToProviderAsync()
+    {
+        if (IsServerOffline || !AutoRedirectToProvider || IsLoading)
+            return;
+
+        // Mirror server behavior: only auto-challenge when exactly one provider exists.
+        if (AuthenticationProviders.Count == 1)
+            await LoginWithProviderAsync(AuthenticationProviders[0]);
     }
 
     [RelayCommand]

LANCommander.Launcher/ViewModels/MainWindowViewModel.cs

@@ -181,8 +181,12 @@ public partial class MainWindowViewModel : ViewModelBase
             
             if (serverOnline)
                 await LoginViewModel.LoadAuthenticationProvidersAsync();
-            
+
             CurrentView = LoginViewModel;
+
+            if (serverOnline)
+                await LoginViewModel.TryAutoRedirectToProviderAsync();
+
             return;
         }
         
@@ -196,6 +200,7 @@ public partial class MainWindowViewModel : ViewModelBase
         LoginViewModel.IsServerOffline = false;
         await LoginViewModel.LoadAuthenticationProvidersAsync();
         CurrentView = LoginViewModel;
+        await LoginViewModel.TryAutoRedirectToProviderAsync();
     }
 
     private async void OnLoginSucceeded(object? sender, EventArgs e)

LANCommander.SDK/Clients/AuthenticationClient.cs

@@ -210,6 +210,24 @@ public class AuthenticationClient(
         }
     }
 
+    public async Task<bool> GetAutoRedirectToProviderAsync()
+    {
+        try
+        {
+            var settings = await apiRequestFactory
+                .Create()
+                .UseRoute("/api/Settings")
+                .GetAsync<Settings>();
+
+            return settings?.Authentication?.AutoRedirectToProvider ?? false;
+        }
+        catch
+        {
+            // Older servers don't expose this setting - default to no auto-redirect
+            return false;
+        }
+    }
+
     public Uri GetAuthenticationProviderLoginUrl(string provider)
     {
         return connectionClient.GetServerAddress().Join($"api/Auth/Login?Provider={provider}");

LANCommander.SDK/Models/Settings/AuthenticationSettings.cs

@@ -11,4 +11,5 @@ public class AuthenticationSettings
     public AuthToken Token { get; set; }
     public bool OfflineModeEnabled { get; set; }
     public bool AllowRegistration { get; set; } = true;
+    public bool AutoRedirectToProvider { get; set; } = false;
 }

LANCommander.Server/Endpoints/SettingsEndpoints.cs

@@ -32,6 +32,7 @@ public static class SettingsEndpoints
             Authentication = new
             {
                 AllowRegistration = settingsProvider.CurrentValue.Server.Authentication.AllowRegistration,
+                AutoRedirectToProvider = settingsProvider.CurrentValue.Server.Authentication.AutoRedirectToProvider,
             }
         };