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

internal/router/router.go

@@ -61,6 +61,7 @@ type Config struct {
 	DeviceAuthMiddleware  *middleware.DeviceAuthMiddleware
 	LoginTracker          *ratelimit.LoginAttemptTracker
 	ScannerHandler        *handlers.Handler
+	JobsHandler           *handlers.JobsHandler
 }
 
 // createJWTMiddleware creates a JWT middleware with proper user context setup
@@ -217,6 +218,7 @@ func RegisterRoutes(cfg *Config) *handlers.Handler {
 	registerConflictRoutes(cfg)
 	registerAnalyticsRoutes(cfg)
 	registerQueueRoutes(cfg)
+	registerJobRoutes(cfg)
 	registerOPDSRoutes(cfg)
 	registerWebSocketRoutes(cfg)
 	registerFrontendRoutes(cfg)