fix: detect network delete/recreate by Docker ID during sync

Network sync compared only by name, so a network deleted and
recreated with the same name but different attributes (driver,
attachable, etc.) was reported as already in sync.

Store Docker's network Id (dockerId column) and compare it against
the live Id during sync. A name match with a dockerId mismatch is
now surfaced as a new "changed" state, with an Update action to
refresh the DB row from the live network.

Fixes #5179