Honestly I think a single, good, planet is enough to 'beat' the game in terms of money - so you could either use an alpha core or just an admin with 2 skills (because ground defense skill is not needed).
That said, it is fun building a super space empire!
Yep, 1 planet is all you need.
Destroyed everything on my other planets and the main one now gives 1.4M/month + 260K industrial capacity.
~30% global marketshare in everything, fuel ~50%.
For single colony hazard doesn't really matter, location/preferably water/farm + 2 ores + organics(or maybe volatiles) are what you are after.
Size of resource deposits doesn't matter that much, market size + core + skill are where the bulk comes from. Just have as many different types as possible.
+-100K running cost is dwarfed by the income and even a ridiculous 20 hazard growth modifier won't make a difference when you have free port and hundreds from growth incentives(turn them off at max size).
Ruins don't scale well with size and are probably just a money drain, you will want heavy industry/refining/fuel anyway.
If you go that route you don't need any colony skills, just 1 warm body with industrial planning. +2 stability is good early, +30% accessibility late.
Or you throw a not-so-warm body at the problem and get everything for free.
You still get 2 extra refueling stations/production boosts and can entirely drop industry(only other reason I have it is the 50% special salvage boost).
~12-15 extra points for combat skills, main downside are obviously lower colony count and a much slower economic start if you don't want to cheese the bar mission early.