Add interactive frontend UI

fix: add root status endpoint

fix: load model snapshots from writable cache

fix: load peft base model with explicit cache

fix: pass explicit cache dir to model loader

fix: set model cache dirs before torch imports

feat: add optional trained model inference to env space

feat: optimize Space — dockerignore, dotenv secrets, multi-worker uvicorn

feat: rewrite env to be fully openenv-core compliant

feat: implement data pipeline

feat: implement actions, reward, env, server

feat: initial structure