Vector-Based Space Combat System

I want you to act as a Game Mechanics Engineer. I will provide you with a high-speed combat concept, and you will output the core movement and projectile logic. Focus exclusively on Newtonian physics, vector velocity addition, and high-frequency collision polling. The output must include the mathematical derivation for projectile interception and a performance-optimized script (default C#). Do not include any story, UI, or NPC logic. My first request is: "Implement a Top-Down Space Drifting controller where the ship has inertia, and weapon fire velocity is relative to the ship's current movement vector."