Add Jobs API for background task management

- Add JobsHandler with CreateJob and GetJobStatus endpoints
- Add jobs router with POST /api/jobs and GET /api/jobs/:jobId routes
- Integrate JobsHandler into main server and router config

cmd/server/main.go

@@ -106,6 +106,7 @@ func main() {
 
 	// Create worker for background tasks
 	worker := services.NewWorker(3)
+	services.WorkerInstance = worker
 
 	koreaderHandler := handlers.NewKOReaderHandler(queries, connManager, queueProcessor)
 	wsHandler := handlers.NewWSHandler(queries, connManager, cfg.JWTSecret, deviceAuthMiddleware)
@@ -123,6 +124,7 @@ func main() {
 	dashboardHandler := handlers.NewDashboardHandler(queries)
 	mediaHandler := handlers.NewMediaHandler(queries, libraryService, worker)
 	matchingHandler := handlers.NewMatchingHandler(queries, connManager)
+	jobsHandler := handlers.NewJobsHandler(queries, worker)
 
 	e := echo.New()
 
@@ -177,6 +179,7 @@ func main() {
 		ConnManager:           connManager,
 		QueueProcessor:        queueProcessor,
 		DeviceAuthMiddleware:  deviceAuthMiddleware,
+		JobsHandler:           jobsHandler,
 		LoginTracker:          loginAttemptTracker,
 	}