feat(application): add IEmailSyncService interface and ForcedSyncIntervalSeconds option to EmailAccountsOptions

src/core/DigitalData.MessagingService.Application/Common/Interfaces/IEmailSyncService.cs

@@ -0,0 +1,6 @@
+namespace DigitalData.MessagingService.Application.Common.Interfaces;
+
+public interface IEmailSyncService
+{
+    public DateTime ForceTriggerSync();
+}

src/core/DigitalData.MessagingService.Application/Common/Options/EmailAccountsOptions.cs

@@ -24,5 +24,11 @@ public class EmailAccountsOptions
     /// Defaults to 300 seconds (5 minutes).
     /// </summary>
     public int SyncIntervalSeconds { get; init; } = 300;
+
+    /// <summary>
+    /// The minimum interval, in seconds, between forced IMAP sync operations regardless of idle state.
+    /// Defaults to 30 seconds (0.5 minute).
+    /// </summary>
+    public int ForcedSyncIntervalSeconds { get; init; } = 30;
 }
 #endif