IPv6 literal host: channel target is invalid for a bare IPv6 address #172

Description

QdrantGrpcClient.newBuilder(host, port, useTls) with a bare IPv6 literal, e.g. newBuilder("fd00::1", 6334, false), fails to connect: ManagedChannelBuilder.forAddress("fd00::1", 6334) builds the channel target dns:///fd00::1:6334, which gRPC cannot parse — an IPv6 literal in an authority must be bracketed.

Workaround

Pass the host pre-bracketed: newBuilder("[fd00::1]", 6334, false).

Expected

Bare IPv6 literals should be bracketed automatically. The Go client already does this (net.JoinHostPort, config.go#getAddr).