fix(gateway): CAR linksystem fixes

gateway/blocks_gateway.go

@@ -262,6 +262,7 @@ func (api *BlocksGateway) GetCAR(ctx context.Context, p ImmutablePath, params Ca
 
 		lsys := cidlink.DefaultLinkSystem()
 		unixfsnode.AddUnixFSReificationToLinkSystem(&lsys)
+		lsys.StorageReadOpener = blockOpener(ctx, blockGetter)
 
 		// TODO: support selectors passed as request param: https://github.com/ipfs/kubo/issues/8769
 		// TODO: this is very slow if blocks are remote due to linear traversal. Do we need deterministic traversals here?
@@ -304,8 +305,10 @@ func walkGatewaySimpleSelector(ctx context.Context, p ipfspath.Path, params CarP
 
 		progress := traversal.Progress{
 			Cfg: &traversal.Config{
-				Ctx:        ctx,
-				LinkSystem: *lsys,
+				Ctx:                            ctx,
+				LinkSystem:                     *lsys,
+				LinkTargetNodePrototypeChooser: bsfetcher.DefaultPrototypeChooser,
+				LinkVisitOnlyOnce:              true, // This is safe for the "all" selector
 			},
 		}