Remove offline sample targets; load containers from appsettings KnownContainers.

Co-authored-by: Cursor <cursoragent@cursor.com>

ZA.CoreService.ESBCertificateManager/Form1.cs

@@ -1,7 +1,6 @@
 using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
 using ZA.CoreService.ESBCertificateManager.Configuration;
-using ZA.CoreService.ESBCertificateManager.Data;
 using ZA.CoreService.ESBCertificateManager.Models;
 using ZA.CoreService.ESBCertificateManager.Services;
 
@@ -1292,17 +1291,26 @@ namespace ZA.CoreService.ESBCertificateManager
             return panel;
         }
 
-        private async Task LoadTargetsAsync()
+        private Task LoadTargetsAsync()
         {
             try
             {
-                SetStatus("Lade Bereitstellungsziele…", isError: false);
-                (ITargetRepository repository, string loadMessage) =
-                    await TargetRepositoryFactory.CreateAsync(_settings);
-
-                _loadedTargets = await repository.GetActiveTargetsAsync();
+                SetStatus("Lade Container aus appsettings (KnownContainers)…", isError: false);
+                _loadedTargets = _sonicDiscovery.BuildTargetsFromConfig();
                 BindTargetsToGrid(_loadedTargets);
-                SetStatus(loadMessage, isError: false);
+
+                if (_loadedTargets.Count == 0)
+                {
+                    SetStatus(
+                        "Keine KnownContainers in appsettings. SonicConnections[].KnownContainers setzen oder „Container laden“.",
+                        isError: true);
+                }
+                else
+                {
+                    SetStatus(
+                        $"{_loadedTargets.Count} Container aus appsettings. Optional: „Container laden“ für Live-Liste.",
+                        isError: false);
+                }
             }
             catch (Exception ex)
             {
@@ -1314,6 +1322,8 @@ namespace ZA.CoreService.ESBCertificateManager
             {
                 RefreshActionButtonStates();
             }
+
+            return Task.CompletedTask;
         }
 
         private void BindTargetsToGrid(IReadOnlyList<DeploymentTarget> targets)