fix: use minimal requirements-server.txt in Docker to avoid downloading torch/ML deps

feat: replace Gradio with React UI — GRPO tab, 730-day sim, 200-entry memory bank

fix: let Gradio auto-select port locally, fix via env vars only

fix: use 127.0.0.1 locally, 0.0.0.0 in Docker via env var

fix: Dockerfile runs Gradio app, not FastAPI server

fix: bump to Python 3.13 to match requirements.txt (audioop-lts)

fix: remove scripts/ COPY, scripts dir not in repo

fix: install git in Docker image for git+ pip dependencies

OpenEnv implementation Done, TODO: LLM/Agent.py