feat: integrate Google Earth 3D Tiles and optimize engine hooks

Introduce structure registry and fix content loader

Fix stall physics, tracer visibility, net packet size, and type modularization

Fix camera gimbal lock flip during vertical dives and improve stall physics/control authority

Fix spawn clipping, sharp vector terrain, WebGPU fallback, modifications data-unification and muzzle-booster, stall buffet av loop

Add GitHub Pages deployment and map system, physics, and renderer changes

Rework flight physics: per-wing stall, corrected inertia, gyroscopic fix, physics HUD