feat(backend): sync limiters on agent connect

Implemented full sync of speed limit configurations when an Agent connects via WebSocket. This ensures that even fresh or restarted agents receive the necessary limiter configurations.

go-backend/internal/http/handler/handler.go

@@ -62,11 +62,13 @@ type flowItem struct {
 }
 
 func New(repo *sqlite.Repository, jwtSecret string) *Handler {
-	return &Handler{
+	h := &Handler{
 		repo:      repo,
 		jwtSecret: jwtSecret,
 		wsServer:  ws.NewServer(repo, jwtSecret),
 	}
+	h.wsServer.OnNodeConnected = h.onNodeConnected
+	return h
 }
 
 func (h *Handler) WebSocketHandler() http.Handler {