refactor(scanner): make poll interval dynamic from database

- Add GetPollInterval() method to MediaScanner to read from database
- Add GetAutoScanEnabled() method to check if auto-scan is enabled
- Remove ScanPollIntervalSeconds from config (now DB-driven)
- Update NewMediaScanner signature to not require interval parameter
- Remove SCAN_POLL_INTERVAL_SECONDS from docker-compose env var

internal/handlers/commonhandlers.go

@@ -16,7 +16,6 @@ type Handler struct {
 	db                *database.Queries
 	scanner           *services.MediaScanner
 	worker            *services.Worker
-	scheduler         *services.Scheduler
 	queueProcessor    *wsync.SyncQueueProcessor
 	queueCtx          context.Context
 	queueCancel       context.CancelFunc
@@ -34,7 +33,6 @@ type Handler struct {
 func NewHandler(db *database.Queries, connManager *wsync.ConnectionManager, queueProcessor *wsync.SyncQueueProcessor, cfg *config.Config) *Handler {
 	ctx, cancel := context.WithCancel(context.Background())
 	worker := services.NewWorker(3)
-	scheduler := services.NewScheduler(worker, db)
 
 	queueCtx, queueCancel := context.WithCancel(context.Background())
 
@@ -42,9 +40,8 @@ func NewHandler(db *database.Queries, connManager *wsync.ConnectionManager, queu
 
 	return &Handler{
 		db:                db,
-		scanner:           services.NewMediaScanner(db, cfg.ScanPollIntervalSeconds),
+		scanner:           services.NewMediaScanner(db),
 		worker:            worker,
-		scheduler:         scheduler,
 		queueProcessor:    queueProcessor,
 		queueCtx:          queueCtx,
 		queueCancel:       queueCancel,