fix: route HF Spaces traffic to Streamlit (port 8501) and add frontend placeholder

Add cleanmark.org branding and update app_port to 5344

Fix: add mmcv fallback in flow_comp.py, remove mmcv from Dockerfile

Fix: use --no-build-isolation for mmcv

Fix: use pip instead of uv for mmcv installation

Fix: install setuptools before mmcv with --no-build-isolation

Fix: add mmcv, set app_port to 8501

Fix: replace libgl1-mesa-glx with libgl1 for Debian trixie

Initial HF Spaces deployment