Add contribution payment options to registries

- Added support for single and amount-specific QR codes.
- Updated `RegistrySettings` model and database schema.
- Enhanced `RegistryAdmin` to configure payment options.
- Introduced `RegistryContributionAmount` for partial fulfillment.
- Updated `RegistryPublic` to display contribution progress.
- Added new models for payment methods and QR code handling.
- Improved privacy by limiting contributor visibility.

src/BirthList.Web/Components/Pages/RegistryAdmin.razor.cs

@@ -39,6 +39,9 @@ public partial class RegistryAdmin : ComponentBase
         builder.AddMarkupContent(3, "<span class='ql-formats'><button class='ql-link'></button><button class='ql-clean'></button></span>");
     };
 
+    private bool _pendingEditorLoad;
+    private string? _lastLoadedHeaderContentHtml;
+
     protected override async Task OnParametersSetAsync()
     {
         var userId = await RegistryUserContext.GetUserIdAsync(CancellationToken.None).ConfigureAwait(false);
@@ -60,14 +63,16 @@ public partial class RegistryAdmin : ComponentBase
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
-        if (!firstRender || TextEditor is null || string.IsNullOrWhiteSpace(SettingsModel.HeaderContentHtml))
+        if (TextEditor is null || !_pendingEditorLoad)
         {
             return;
         }
 
         try
         {
-            await TextEditor.LoadHTMLContent(SettingsModel.HeaderContentHtml).ConfigureAwait(false);
+            await TextEditor.LoadHTMLContent(SettingsModel.HeaderContentHtml ?? string.Empty).ConfigureAwait(false);
+            _lastLoadedHeaderContentHtml = SettingsModel.HeaderContentHtml ?? string.Empty;
+            _pendingEditorLoad = false;
         }
         catch (JSException)
         {
@@ -229,6 +234,17 @@ public partial class RegistryAdmin : ComponentBase
         Admins = await RegistryService.GetRegistryAdminsAsync(RegistryId, CancellationToken.None).ConfigureAwait(false);
     }
 
+    protected void AddContributionAmountQrCode()
+    {
+        SettingsModel.ContributionAmountQrCodes.Add(new ContributionAmountQrCodeModel());
+    }
+
+    protected void RemoveContributionAmountQrCode(ContributionAmountQrCodeModel model)
+    {
+        ArgumentNullException.ThrowIfNull(model);
+        SettingsModel.ContributionAmountQrCodes.Remove(model);
+    }
+
     private async Task LoadAsync()
     {
         var settings = await RegistryService.GetRegistrySettingsAsync(RegistryId, CancellationToken.None).ConfigureAwait(false);
@@ -244,6 +260,11 @@ public partial class RegistryAdmin : ComponentBase
             SettingsModel.BankAccountIban = settings.BankAccountIban;
             SettingsModel.BankAccountBic = settings.BankAccountBic;
             SettingsModel.ShowBankAccountName = settings.ShowBankAccountName;
+            SettingsModel.ContributionQrCodeUrl = settings.ContributionQrCodeUrl;
+            SettingsModel.ContributionAmountQrCodes = settings.ContributionAmountQrCodes;
+
+            var currentHeaderContent = SettingsModel.HeaderContentHtml ?? string.Empty;
+            _pendingEditorLoad = currentHeaderContent != _lastLoadedHeaderContentHtml;
         }
 
         Admins = await RegistryService.GetRegistryAdminsAsync(RegistryId, CancellationToken.None).ConfigureAwait(false);