add church profile.

API/ROLAC.API/Services/ISettingsService.cs

@@ -0,0 +1,17 @@
+using ROLAC.API.DTOs.Settings;
+
+namespace ROLAC.API.Services;
+
+/// <summary>
+/// Reads and writes the singleton SiteSetting and NotificationSetting rows. Notification secrets
+/// are masked on read and treated as write-only on update (blank = keep). After a notification
+/// update the runtime cache is reloaded so changes apply without an API restart.
+/// </summary>
+public interface ISettingsService
+{
+    Task<SiteSettingDto> GetSiteAsync();
+    Task UpdateSiteAsync(UpdateSiteSettingRequest request);
+
+    Task<NotificationSettingDto> GetNotificationAsync();
+    Task UpdateNotificationAsync(UpdateNotificationSettingRequest request);
+}