Implement mail service with configuration and settings management

FoodsharingSiegen.Server/Pages/Settings.razor

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+@page "/settings"
+
+@inherits FsBase
+
+<PageTitle>Einstellungen - @AppSettings.Terms.Title</PageTitle>
+
+<div style="width: 100%; max-width: 500px;">
+    <h2>Einstellungen</h2>
+
+    <div class="card mt-3">
+        <div class="card-header" style="padding: .5rem 0 0 1rem;"><h5>Mail Service</h5></div>
+        <div class="card-body">
+            <p>
+                <strong>SMTP Server:</strong> @AppSettings.Mail.Host<br />
+                <strong>Port:</strong> @AppSettings.Mail.Port<br />
+                <strong>SSL:</strong> @(AppSettings.Mail.UseSsl ? "Ja" : "Nein")<br />
+            </p>
+            <hr />
+            <Fields Class="my-3">
+                <Field ColumnSize="ColumnSize.Is12">
+                    <FieldLabel>Testmail-Empfänger</FieldLabel>
+                    <FieldBody>
+                        <TextEdit @bind-Text="TestMailReceiver" Placeholder="E-Mail Adresse"></TextEdit>
+                    </FieldBody>
+                </Field>
+            </Fields>
+            <Button Color="Color.Primary" Clicked="SendTestMail">Testmail senden</Button>
+        </div>
+    </div>
+</div>

FoodsharingSiegen.Server/Pages/Settings.razor.cs

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+using FoodsharingSiegen.Contracts.Helper;
+using FoodsharingSiegen.Server.Service;
+using Microsoft.AspNetCore.Components;
+using System;
+using System.Threading.Tasks;
+
+namespace FoodsharingSiegen.Server.Pages
+{
+    public partial class Settings
+    {
+        [Inject]
+        public IMailService MailService { get; set; } = null!;
+
+        private string TestMailReceiver { get; set; } = string.Empty;
+
+        protected override async Task InitializeDataAsync()
+        {
+            if (!CurrentUser.IsAdmin())
+            {
+                NavigationManager.NavigateTo("/");
+                return;
+            }
+            await Task.CompletedTask;
+        }
+
+        private async Task SendTestMail()
+        {
+            if (string.IsNullOrWhiteSpace(TestMailReceiver))
+            {
+                await Notification.Error("Bitte eine Empfänger-Adresse angeben.");
+                return;
+            }
+
+            try
+            {
+                await MailService.SendEmailAsync(TestMailReceiver, "Testmail", "Dies ist eine Testmail.");
+                await Notification.Success("Testmail versendet.");
+            }
+            catch (Exception ex)
+            {
+                await Notification.Error($"Fehler beim Senden: {ex.Message}");
+            }
+        }
+    }
+}