Implement security enhancements

[coderabbitai]

Objective

Strengthen the security of SocrAI before public release.

Tasks

• Review and enhance authentication mechanisms
• Implement rate limiting for API endpoints
• Add OpenAI API key protection measures
• Secure database connections
• Implement proper error handling to prevent information leakage
• Add input validation and sanitization

Why this is important

Security is crucial for protecting user data and preventing abuse of the AI integration.

References

• This issue was created from PR: impro #6