Hi cosvis, welcome to TOEquest!
I liked you post and noticed similarities between your theory and mine. I don't know if you've read it but it's called the three theory and is on a forum here. The three different aspects you mention etc. My theory says the same thing, that the universe has existed forever and will continue to exist forever, like your eternity-eternity speculation.
I too have had thoughts about the biological evolution of galaxies which are non-organic. I'll post it today sometime, I wrote it when I was 17 and some ideas are a bit wacky but they make some sense at least!
The question that you asked about 'is energy continuously created' in my theory has both yes and no answers. There is a law, I think it's thermodynamics, that says that energy cannot be created. In my theory this is also true, because all the matter/energy in the universe has always existed. However, it also says that when energy/matter enter a black hole, they emerge from a white hole (in the same universe) but have been transformed into their opposites. Therefore, if dark energy or whatever you want to call it, entered a black hole, then it would emerge as energy. What do you make of that?
'What is the mechanism in the universe that makes this possible?'- the three theory would suggest that this is magnetism.