fix: add main function to app.py for openenv multi-mode deployment validator

fix: smart redirect to /web for browsers to fix HF UI, keep JSON for APIs

fix: restore UI, add /tasks /grade, clamp scores to (0.05, 0.95)

Massive Rewrite: Rebuilt Phase 2 standalone validation constraints perfectly mapped to 0.05-0.95

Rewrite environment, app endpoints, and openenv.yaml for Phase 2 validation

hf

good to go

hf issues now fixed

refactor: update README for SQL AI Data Analyst, enhance installation instructions, and improve architecture workflow; modify app initialization in server to use SqlEnvironment directly

feat: implement SQL agent environment with OpenEnv integration, SQLite management, and automated task grading