Simplify EnvelopeReceiverPage logic and update settings

Removed redundant `EnvelopeKey` checks in `LogoutAsync` and
`OnInitializedAsync` methods, simplifying logout and initialization
logic. Updated navigation URL to `/envelope/login/`. Streamlined
document fetching logic by removing unnecessary conditions.

Added logging in `CreateReportInstance` to track report creation.
Enabled `ForceToUseFakeDocument` in `appsettings.json` to default
to using fake documents. These changes improve code clarity and
align behavior with updated requirements.

EnvelopeGenerator.ReceiverUI/Pages/EnvelopeReceiverPage_DxReportViewer.razor

@@ -162,7 +162,6 @@
                 </svg>
                 PDF exportieren
             </button>
-            @if (!string.IsNullOrWhiteSpace(EnvelopeKey)) {
             <button class="btn btn-sm btn-outline-danger" @onclick="LogoutAsync" disabled="@IsLoggingOut" title="Abmelden">
                     @if (IsLoggingOut) {
                         <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
@@ -173,7 +172,6 @@
                     </svg>
                     }
             </button>
-            }
         </div>
     </div>
 </div>
@@ -311,33 +309,29 @@ Shown="OnPopupShownAsync">
     int _lastOverlayViewerKey = -1;
 
     async Task LogoutAsync() {
-        if (string.IsNullOrWhiteSpace(EnvelopeKey) || IsLoggingOut) return;
+        if (IsLoggingOut) return;
         IsLoggingOut = true;
         await InvokeAsync(StateHasChanged);
         await AuthService.LogoutEnvelopeReceiverAsync(EnvelopeKey);
-        Navigation.NavigateTo($"/login/{Uri.EscapeDataString(EnvelopeKey)}", forceLoad: true);
+        Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}", forceLoad: true);
     }
 
     protected override async Task OnInitializedAsync() {
-        if (!string.IsNullOrWhiteSpace(EnvelopeKey)) {
         var hasAccess = await AuthService.CheckEnvelopeAccessAsync(EnvelopeKey);
         if (!hasAccess) {
-                Navigation.NavigateTo($"/login/{Uri.EscapeDataString(EnvelopeKey)}");
+            Navigation.NavigateTo($"/envelope/login/{Uri.EscapeDataString(EnvelopeKey)}");
             return;
         }
-            else
-            {
+
         ActiveSignatureTab = SignatureTabDraw;
         SignaturePopupVisible = true;
         SignatureValidationMessage = null;
         PopupValidationMessage = null;
-            }
-        }
 
-        _annotations = await AnnotationService.GetAnnotationsAsync(EnvelopeKey ?? "fake");
-        _envelopeReceiver = await EnvelopeReceiverService.GetAsync(EnvelopeKey ?? "fake");
+        _annotations = await AnnotationService.GetAnnotationsAsync(EnvelopeKey);
+        _envelopeReceiver = await EnvelopeReceiverService.GetAsync(EnvelopeKey);
 
-        if (!AppOptions.Value.ForceToUseFakeDocument && !string.IsNullOrWhiteSpace(EnvelopeKey)) {
+        if (!AppOptions.Value.ForceToUseFakeDocument) {
             var (pdfBytes, _) = await DocumentService.GetDocumentAsync(EnvelopeKey);
             if (pdfBytes is { Length: > 0 })
                 _basePdfBytes = pdfBytes;
@@ -574,6 +568,7 @@ Shown="OnPopupShownAsync">
     }
 
     XtraReport CreateReportInstance() {        
+        Console.WriteLine("Created with predefinedReports");
         return ReportStorage.TryGetReport("LargeDatasetReport", out var savedReport)
             ? savedReport
             : PredefinedReports.ReportsFactory.GetReport("LargeDatasetReport");

EnvelopeGenerator.ReceiverUI/wwwroot/appsettings.json

@@ -1,7 +1,7 @@
 {
   "Api": {
     "BaseUrl": "",
-    "ForceToUseFakeDocument": false
+    "ForceToUseFakeDocument": true
   },
   "PdfViewer": {
     "ThumbnailBaseScale": 0.75,