Fix 500 Internal Server Error: correct server initialization and models

fix: corrected /step payload in UI and added backend exception handlers

fix: migrated models to Pydantic to solve 500 error

fix: structural changes for OpenEnv multi-mode deployment

Prepare and optimize for Hugging Face Spaces deployment

Update app.py and environment.py

feat: add interactive Cloud Security Dashboard UI

feat: Add CloudSecurityAuditor OpenEnv environment