perf(glb): further reduce bake params to avoid 120s timeout

perf(glb): speed up bake by reducing hardcoded defaults

fix(zerogpu): lazy-import nvdiffrast in postprocessing_utils

fix(dino): drop default HF near-assets; use torch.hub facebookresearch/dinov2

fix(space): split ZeroGPU cold-start paths and add timing diagnostics

restore: full Space tree + assets (recover from minimal force-push); keep ZeroGPU app.py