Add advanced envelope settings and EnvelopeTypeService

Enhanced `EnvelopeDto` with new properties for advanced settings, including final email options, reminders, and expiration settings. Updated `SenderEditorPage.razor` to include a new UI section for configuring these settings, with dropdowns, checkboxes, and input fields.

Introduced `EnvelopeTypeService` to fetch envelope type data from the backend and applied defaults based on the selected envelope type. Registered the service in `Program.cs` for dependency injection.

Improved lifecycle methods in `SenderEditorPage.razor` to load and apply envelope settings. Enhanced localization, error handling, and data binding for the new settings. Updated `CreateEnvelopeCommand` to include the new properties.

Refactored code for better organization and maintainability, and added logging for debugging envelope type loading issues.

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/EnvelopeTypeService.cs

@@ -0,0 +1,22 @@
+using EnvelopeGenerator.Application.Common.Dto;
+using System.Net.Http.Json;
+using System.Text.Json;
+
+namespace EnvelopeGenerator.Server.Client.Services;
+
+public class EnvelopeTypeService(IHttpClientFactory clientFactory)
+{
+    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);
+
+    public async Task<IReadOnlyList<EnvelopeTypeDto>> GetAsync(CancellationToken cancel = default)
+    {
+        var http = clientFactory.CreateClient("EnvelopeGenerator.Server");
+        var response = await http.GetAsync("/api/EnvelopeType", cancel);
+
+        if (!response.IsSuccessStatusCode)
+            return [];
+
+        var data = await response.Content.ReadFromJsonAsync<List<EnvelopeTypeDto>>(JsonOptions, cancel);
+        return data ?? [];
+    }
+}