refactor(router): remove duplicate progress routes, add ProgressService to config

- Remove GET /progress/:id and POST /progress/:id from progress routes.
  These were superseded by the media-item progress routes. Only
  GET /progress/:id/history remains.

- Add ProgressService to router.Config so sync.go can inject it into
  KoboHandler via SetProgressService().

- Inject ProgressService into KoboHandler at route registration time
  rather than requiring a separate setup step.

- Update comment from 'Legacy progress routes' to 'Progress routes'.

internal/router/sync.go

@@ -32,6 +32,7 @@ func registerSyncRoutes(cfg *Config) {
 	// Kobo devices use URL path: /api/sync/kobo/{token}/markup
 	// API clients can use Authorization header: Authorization: Bearer {token}
 	koboHandler := handlers.NewKoboHandler(cfg.Queries, cfg.ConnManager)
+	koboHandler.SetProgressService(cfg.ProgressService)
 	koboSync := e.Group("/api/sync/kobo/:token")
 	koboSync.POST("/markup", cfg.DeviceAuthMiddleware.Authenticate(koboHandler.Markup))
 	koboSync.POST("/bookmark", cfg.DeviceAuthMiddleware.Authenticate(koboHandler.Bookmark))