fix: add OpenEnv root reset and step aliases

feat: add site template registry and agent integration

fix: resolve scraper functionality and plugin issues

feat: add WebSocket support for real-time scraper progress updates

feat: add providers API endpoints with model and cost tracking

feat: update model router with NVIDIA support and latest model scores

feat: redesign Dashboard with 2-view split and improved UX

feat: add static file serving and improve UI/UX design

feat: register settings and plugins API routes

chore: initialize backend project structure with FastAPI