chore: untrack server/__pycache__ files

fix: use correct HF router URL /hf-inference/v1/ (not /models/{id}/v1/)

fix: update HF proxy URL to router.huggingface.co (api-inference deprecated 410)

fix: serve index.html with no-cache headers to prevent CDN/browser stale cache

fix: proxy HF Inference API through FastAPI to bypass HF Spaces CSP

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

fix: pipeline-aware ordering, YoY demand signal, reward rebalancing

Added PPO model and reward.py

Added trained PPO model + app.py UI changes for HF Spaces

Add P&L reward function, daily spoilage, stochastic lead time, and reward visualization

OpenEnv implementation Done, TODO: LLM/Agent.py