Snow Machine Tiers — Basic to Endgame

Add a progression of snow-making equipment, from entry-level fan guns up through larger tower cannons to endgame high-efficiency systems that can make snow at warmer temperatures and higher volume (inspired by high-temp snowmaking hardware like Latitude90's). Later tiers would unlock as reputation/economy milestones are hit, giving players a reason to upgrade snowmaking infrastructure instead of just placing more of the same machine.