support PWA notification.

API/ROLAC.API/Services/Notifications/NotificationSettingsService.cs

@@ -15,6 +15,7 @@ public interface INotificationSettingsService
 {
     SmtpOptions GetSmtp();
     LineOptions GetLine();
+    WebPushOptions GetWebPush();
     void Reload();
 }
 
@@ -27,6 +28,7 @@ public sealed class NotificationSettingsService : INotificationSettingsService
 
     private SmtpOptions? _smtp;
     private LineOptions? _line;
+    private WebPushOptions? _webPush;
 
     public NotificationSettingsService(
         IServiceScopeFactory scopeFactory,
@@ -50,12 +52,19 @@ public sealed class NotificationSettingsService : INotificationSettingsService
         return _line!;
     }
 
+    public WebPushOptions GetWebPush()
+    {
+        EnsureLoaded();
+        return _webPush!;
+    }
+
     public void Reload()
     {
         lock (_gate)
         {
             _smtp = null;
             _line = null;
+            _webPush = null;
         }
     }
 
@@ -63,7 +72,7 @@ public sealed class NotificationSettingsService : INotificationSettingsService
     {
         lock (_gate)
         {
-            if (_smtp is not null && _line is not null)
+            if (_smtp is not null && _line is not null && _webPush is not null)
                 return;
 
             using var scope = _scopeFactory.CreateScope();
@@ -72,9 +81,11 @@ public sealed class NotificationSettingsService : INotificationSettingsService
 
             if (row is null)
             {
-                // Not seeded yet — use the appsettings values so sends still work.
+                // Not seeded yet — use the appsettings values so sends still work. Web push has no
+                // appsettings fallback; it stays disabled until the row exists with VAPID keys.
                 _smtp = _smtpFallback.Value;
                 _line = _lineFallback.Value;
+                _webPush = new WebPushOptions();
                 return;
             }
 
@@ -93,6 +104,12 @@ public sealed class NotificationSettingsService : INotificationSettingsService
                 ChannelAccessToken = row.LineChannelAccessToken,
                 ChannelSecret      = row.LineChannelSecret,
             };
+            _webPush = new WebPushOptions
+            {
+                PublicKey  = row.VapidPublicKey,
+                PrivateKey = row.VapidPrivateKey,
+                Subject    = row.VapidSubject,
+            };
         }
     }
 }