[client, management] offload client config generation to the client (#6711)

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>
Co-authored-by: crn4 <vladimir@netbird.io>
Co-authored-by: pascal <pascal@netbird.io>

management/server/networks/routers/manager.go

@@ -104,6 +104,8 @@ func (m *managerImpl) CreateRouter(ctx context.Context, userID string, router *t
 
 		router.ID = xid.New().String()
 
+		router.PublicID = xid.New().String()
+
 		err = transaction.CreateNetworkRouter(ctx, router)
 		if err != nil {
 			return fmt.Errorf("failed to create network router: %w", err)
@@ -199,6 +201,11 @@ func (m *managerImpl) updateRouterInTransaction(ctx context.Context, transaction
 		return nil, nil, affectedpeers.Change{}, status.NewRouterNotPartOfNetworkError(router.ID, router.NetworkID)
 	}
 
+	// Preserve PublicID from the existing router so the upstream
+	// UpdateNetworkRouter (which does Updates(router) with Select("*"))
+	// doesn't clobber it with the request's zero value.
+	router.PublicID = existing.PublicID
+
 	if err = transaction.UpdateNetworkRouter(ctx, router); err != nil {
 		return nil, nil, affectedpeers.Change{}, fmt.Errorf("failed to update network router: %w", err)
 	}

management/server/networks/routers/types/router.go

@@ -13,6 +13,7 @@ type NetworkRouter struct {
 	ID         string `gorm:"primaryKey"`
 	NetworkID  string `gorm:"index"`
 	AccountID  string `gorm:"index"`
+	PublicID   string `json:"-"`
 	Peer       string
 	PeerGroups []string `gorm:"serializer:json"`
 	Masquerade bool
@@ -81,6 +82,7 @@ func (n *NetworkRouter) Copy() *NetworkRouter {
 		ID:         n.ID,
 		NetworkID:  n.NetworkID,
 		AccountID:  n.AccountID,
+		PublicID:   n.PublicID,
 		Peer:       n.Peer,
 		PeerGroups: n.PeerGroups,
 		Masquerade: n.Masquerade,