Fix Docker: pin python:3.10-bookworm with amd64 platform to fix registry manifest errors

Fix Docker build: use full python:3.10 image, add missing COPY for server/ and pyproject.toml

Add OpenEnv server (app.py) — expose /reset /step /state /ws /health endpoints

Add HF Spaces frontmatter with openenv tag + fix Dockerfile

feat: complete OpenEnv compliance, tasks, and logic fixes