refactor: replace STL intermediary with OCC-native STEP→GLB pipeline
- export_step_to_gltf.py: STEP→GLB via RWGltf_CafWriter + BRepBuilderAPI_Transform
(mm→m pre-scaling, XCAFDoc_ShapeTool.GetComponents_s static method)
- Blender scripts (blender_render.py, still_render.py, turntable_render.py,
export_gltf.py, export_blend.py): import GLB instead of STL, remove _scale_mm_to_m
- step_tasks.py: add generate_gltf_production_task, remove generate_stl_cache,
replace _bbox_from_stl with _bbox_from_glb (trimesh), auto-queue geometry GLB
after thumbnail render
- render_blender.py: replace _stl_from_cache_or_convert with _glb_from_step,
remove convert_step_to_stl and export_per_part_stls
- domains/rendering/tasks.py: update render_turntable_task, export_gltf/blend tasks
to use GLB instead of STL
- cad.py: remove STL download/generate endpoints, add generate-gltf-production
- admin.py: generate-missing-stls → generate-missing-geometry-glbs
- Frontend: replace STL cache UI with GLB generate buttons, remove stl_cached field
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Hartmut
95cfe0aa93