add volcanic terrain map with procedural alpine terrain

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

Implement terrain, map coordinate, and GLB collision upgrades, configure WebSockets keepalive, and fix client MapSchema callbacks TypeError

Introduce structure registry and fix content loader

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

Fix clouds, fog edge, terrain jaggedness, atmosphere colours, and cockpit overlay

World scale, atmosphere, and tactical chart overhaul

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

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