"According to astrophysicians:
A localized and temporary system which defies laws of physics: negative entropy
Everything that exists deteriorates with time, except life (as long as it lives)."

Life doesn't defy physics. It simply uses energy which is available.
When humans can create energy [really create energy- rather transform one type of energy into another] life will defy physics.
But since as far as we know, the universe was created from nothing, it's the universe or whatever created it that defied physics.

"Maybe searching for other signs of negative entropy would be interesting..But no one knows what it would look like.

According to an astrochemist: the production of a lot of oxygen (no other known process produces that much oxygen)"

Obviously stars produce a lot more oxygen than life.

And a water planet could produce oxygen without life. If a planet has oxygen it's probably indicates life, but it's not a certainty. And planet with a lot of oxygen, indicates the possibility of animal life.
There are regions of space in which massive amount of water was produced by star activity. Therefore there are probably regions in space with planets comprised of mostly of water.

Most of Earth's oxygen is it's rocks- there is far more oxygen in Moon surface rock than all the oxygen in earth atmosphere.
What happens when you have situation in which everything is oxidized and there is still a lot more oxygen left over. Wherever you have entire planets of mostly water, you will probably have that situation.

"But what is a creative force, a sacred spark? Isn't that also a source of conflict? "

Well, if a "robot civilization" was fighting wars, I would assume it's got intelligence [rather than a bunch of mindless robots perfectly performing some million year old program].

Isn't any conflict some kind effort to resolve a problem- though of course, generally a problem that caused a war, may not be resolved by a war. But to end any war something has to be "seen" as a some kind of problem that has to "appear" to be resolved.