NaturalCAD: restore CAD runtime and backend polling

NaturalCAD: restore HF Dockerfile without build123d

NaturalCAD: use local fallback during worker debugging

NaturalCAD: remove CAD dependencies from frontend Space

NaturalCAD: final HF runtime attempt with pure pip stack

NaturalCAD: align HF Dockerfile with miniforge base user

NaturalCAD: use strict conda-forge runtime for HF Space

NaturalCAD: simplify HF CAD runtime and add smoke test

NaturalCAD: expose Conda lib path for HF runtime

NaturalCAD: add hosted backend flow and Space fixes

Fix miniconda environment path permissions for non-root user

Explicitly construct build123d dependencies to bridge pip and conda

Fix conda env resolving by installing ocp via conda and build123d via pip

Use Miniconda in Dockerfile for reliable build123d installation

Switch Hugging Face Space to Docker SDK to fix build123d dependencies