feat(powerups): add infinite ammo powerup mechanics and UI integration

feat(player): enhance movement mechanics with sliding, jump buffering, and wall bounce features

feat(player): add crouch functionality with speed and aim adjustments

feat(shaman): add shaman enemy type with fireball + teleport; refactor enemy typing; improve visuals, aim, and portal FX\n\n- Add shaman enemy (hood, cape, staff, glowing eyes)\n- Fireball projectile: glow, ring, light, flicker; faster speed\n- Aim fix: target camera, update world matrices, prevent reversed shots\n- Teleport: more frequent, portal FX at depart/arrive\n- Refactor enemies to be type-aware (orc/shaman)\n- Waves: spawn 1 shaman per wave\n- Track player velocity for future prediction\n- Add portal FX system

Initial commit: Orcs In The Forest