Fix dashboard logging URL to use proxy path, force Docker rebuild

Force Docker rebuild for frontend changes

Fix: copy Node.js 20 from build stage instead of apt install

Restore OpenEnv with optimized Docker multi-stage build

Fix Dockerfile: use node:20-slim with python3 venv

Add RL training environment with OpenEnv backend

Trigger rebuild

Deploy full Next.js origami simulator to HF Space

Initial deploy: OpenEnv RL environment for origami crease patterns