fix: gate extra EndpointsConfig behind API >= 1.44

Before API 1.44 (Docker Engine 25.0), ContainerCreate only accepted a
single EndpointsConfig entry. Passing multiple entries silently drops
all but one network, leaving containers under-connected on older daemons
such as Docker 20.10 or Synology DSM 7.1/7.2.

Add apiVersion144 constant and wrap the secondary-networks loop in
defaultNetworkSettings so that only the primary network is included in
the ContainerCreate call when the negotiated API version is below 1.44.

Signed-off-by: jarek <jkrochmalski@gmail.com>