Add club settings and use club name in PDF exports

src/Duempelkas.Infrastructure/Services/SettingsService.cs

@@ -0,0 +1,55 @@
+using System.Text.Json;
+using Duempelkas.App.Services;
+
+namespace Duempelkas.Infrastructure.Services;
+
+public class SettingsService : ISettingsService
+{
+    private static readonly string SettingsPath = Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+        "Duempelkas", "settings.json");
+
+    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };
+
+    public async Task<string?> GetClubNameAsync()
+    {
+        var settings = await LoadAsync();
+        return settings.ClubName;
+    }
+
+    public async Task SetClubNameAsync(string? clubName)
+    {
+        var settings = await LoadAsync();
+        settings.ClubName = string.IsNullOrWhiteSpace(clubName) ? null : clubName.Trim();
+        await SaveAsync(settings);
+    }
+
+    private static async Task<AppSettings> LoadAsync()
+    {
+        if (!File.Exists(SettingsPath))
+            return new AppSettings();
+
+        try
+        {
+            var json = await File.ReadAllTextAsync(SettingsPath);
+            return JsonSerializer.Deserialize<AppSettings>(json) ?? new AppSettings();
+        }
+        catch
+        {
+            return new AppSettings();
+        }
+    }
+
+    private static async Task SaveAsync(AppSettings settings)
+    {
+        var dir = Path.GetDirectoryName(SettingsPath)!;
+        Directory.CreateDirectory(dir);
+        var json = JsonSerializer.Serialize(settings, JsonOptions);
+        await File.WriteAllTextAsync(SettingsPath, json);
+    }
+
+    private class AppSettings
+    {
+        public string? ClubName { get; set; }
+    }
+}