Fix: Add fallback database path when /data not available in HF Spaces

Security & HF Spaces fixes: Enable CSRF, auth middleware, persistent storage

Fix OAuth according to HF official documentation

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Add 'itsdangerous' dependency for session management and enhance OAuth configuration with scope validation and warnings for unsupported scopes in Hugging Face Spaces.

Update session management in FastAPI app, modify OAuth scopes in environment configuration, and enhance .env.example with session security details.

Implement conditional authentication middleware and OAuth routes for Hugging Face Spaces integration. Enhance environment debugging and add environment info endpoint. Update README with OAuth configuration details and improve startup logging.

Add environment configuration template, enhance .gitignore, and refactor configuration loading. Removed deprecated scripts and improved setup process with a new setup script.

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🧹 Clean up: Remove backend/scripts/ and __pycache__ files

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