refactor(architecture): enforce module boundaries

Tiku.Application/Jobs/BackgroundJobModels.cs

@@ -35,12 +35,16 @@ public sealed record BackgroundJobItem(
     Guid? OutputAssetId,
     JsonElement Result);
 
-public interface IBackgroundJobService
+public interface IBackgroundJobQueue
 {
     Task<BackgroundJobItem> EnqueueAsync(
         CreateBackgroundJobCommand command,
         CancellationToken cancellationToken = default);
 
+}
+
+public interface IBackgroundJobProcessor
+{
     Task<int> ProcessPendingAsync(
         string workerId,
         int batchSize,
@@ -54,6 +58,10 @@ public interface IBackgroundJobService
         string workerId,
         CancellationToken cancellationToken = default);
 
+}
+
+public interface IBackgroundJobOperations
+{
     Task<IReadOnlyCollection<BackgroundJobItem>> ListAsync(
         Guid tenantId,
         string? jobType = null,
@@ -85,3 +93,23 @@ public interface IBackgroundJobService
         Guid actorUserId,
         CancellationToken cancellationToken = default);
 }
+
+public interface IBackgroundJobService :
+    IBackgroundJobQueue,
+    IBackgroundJobProcessor,
+    IBackgroundJobOperations;
+
+public sealed record BackgroundJobExecutionContext(
+    Guid JobId,
+    Guid TenantId,
+    string JobType,
+    JsonElement Payload);
+
+public interface IBackgroundJobHandler
+{
+    string JobType { get; }
+
+    Task<JsonElement> HandleAsync(
+        BackgroundJobExecutionContext context,
+        CancellationToken cancellationToken = default);
+}