Fix apt package: libgl1-mesa-glx -> libgl1 for Debian Trixie

Fix PyTorch install URL: use --extra-index-url for CPU wheels

Fix Dockerfile: extract mmcv.ops shim to separate Python file

Fix: inline MMCV_WITH_OPS=0 in RUN + --no-build-isolation

Use mmcv-full with MMCV_WITH_OPS=0 (skip C++ extension build)

Switch to Docker SDK for reliable mmcv-full build