feat: pause/resume physics + reset scene buttons in ImGui
- 'Pause Physics' / 'Resume Physics' toggle button in debug panel - 'Reset Scene' button: deletes all objects (except Camera, lights, Floor), recreates scene via CreateObjects() - CreateScene split: CreateScene (floor + lights) vs CreateObjects (all dynamic/decorative objects) — Reset only recreates objects - physicsEnabled flag controls physicsWorld.Update + SyncTransforms - Removed duplicate light creation in CreateObjects
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