Fix snapshotter initialization and remove initial snapshot on startup

- Remove immediate snapshot when periodic goroutine starts
- Fix variable shadowing issue in snapshotter creation
- Add debug logging for snapshotter shutdown
- Snapshots now only occur after 10 minutes or on shutdown

internal/routewatch/app.go

@@ -73,12 +73,12 @@ func New(deps Dependencies) *RouteWatch {
 
 	// Create snapshotter unless disabled (for tests)
 	if os.Getenv("ROUTEWATCH_DISABLE_SNAPSHOTTER") != "1" {
-		snapshotter, err := snapshotter.New(deps.RoutingTable, deps.Logger)
+		snap, err := snapshotter.New(deps.RoutingTable, deps.Logger)
 		if err != nil {
 			deps.Logger.Error("Failed to create snapshotter", "error", err)
 			// Continue without snapshotter
 		} else {
-			rw.snapshotter = snapshotter
+			rw.snapshotter = snap
 		}
 	}
 
@@ -153,9 +153,12 @@ func (rw *RouteWatch) Run(ctx context.Context) error {
 
 	// Take final snapshot before shutdown if snapshotter is available
 	if rw.snapshotter != nil {
+		rw.logger.Info("Shutting down snapshotter")
 		if err := rw.snapshotter.Shutdown(); err != nil {
 			rw.logger.Error("Failed to shutdown snapshotter", "error", err)
 		}
+	} else {
+		rw.logger.Info("No snapshotter available")
 	}
 
 	return nil