48f31513c7
Adds a catch-all fallback to hostMapper.Lookup() that matches any hostname when a '.' mapping exists. After the existing three-phase matching (exact -> dot-prefix -> suffix walk) fails, the lookup now checks for a standalone '.' entry as a final fallback. This enables users to map all hostnames to a single IP (e.g., for SNI proxy usage) with a simple configuration like 'hosts=.:<ip>'. Fixes go-gost/gost#228