chore(multiplayer): Phase 0 refactors + graphics/perf settings groundwork

Lands the non-networked Phase 0 tasks from multiplayer-todo.md (ship/camera/
arena refactors, sim constants, background FPS handling) plus a first pass
at exposing graphics/performance settings (presets, resolution scaling,
vsync, FPS cap, perf overlay) and a GPU profiling harness for the
real-hardware follow-up in task 0.15b.

Game/scripts/hud_attitude_indicator.gd

@@ -38,7 +38,7 @@ func _process(delta: float) -> void:
 	_pitch = new_pitch
 	_roll = new_roll
 	if changed:
-		queue_redraw()
+		_throttled_redraw(delta)
 
 
 func _draw() -> void: