[TASK] Security: Implement password reset and security hardening features

[sbusso]

Parent Feature

Related to feature #4

Task Description

Implement advanced security features including password reset functionality, rate limiting, CSRF protection, and session security.

Acceptance Criteria

• Password reset endpoint with email verification
• Email service integration for password reset links
• Secure password reset token generation and validation
• Rate limiting for authentication attempts (5 attempts per 15 minutes)
• CSRF protection for authentication endpoints
• Security headers implementation (HSTS, CSP, etc.)
• Session timeout configuration and enforcement
• Brute force protection with account lockout
• Audit logging for authentication events
• Password complexity requirements enforcement

Implementation Notes

• Use cryptographically secure random tokens for password reset
• Implement exponential backoff for rate limiting
• Set appropriate CSRF token expiration times
• Log authentication attempts for security monitoring
• Use secure headers middleware for protection

Definition of Done

• Implementation complete with all security features functional
• Security testing performed (penetration testing basics)
• Rate limiting tested under load
• Email integration tested in development environment
• Security review completed by team
• Documentation updated with security configurations

Dependencies

• Backend authentication API ([TASK] Backend: Implement user authentication database schema and core API endpoints #6)
• Email service configuration
• Redis or similar for rate limiting storage

Area

Security

Estimated Effort

Medium: 1-3 days