feat: split_04~10新增attachable_part_hint字段(30%配额,共210条),明确要求场景包含可整体替换/拆卸的装饰部件;split_01~03未改动;同步更新README (part 2)

refine: 仅100条query明确要求复用现有glb资产，其余900条sample_asset_glbs清空；同步更新README (part 2)

refine: 仅100条query明确要求复用现有glb资产，其余900条sample_asset_glbs清空；同步更新README

Add 1000 3D scene queries (10 stratified splits x 100), README, glb samples and reference images (part 3)

Add 1000 3D scene queries (10 stratified splits x 100), README, glb samples and reference images (part 2)