[4.3] Origin check middleware & UUID validation #26
Description
Milestone: 4 – UX Polish & NFRs
Size: S (≤ 2 hours)
Labels: backend, security
Description
Implement security middleware for origin validation and UUID validation to enhance application security.
Acceptance Criteria
- Origin check middleware implemented
- UUID validation for room IDs
- Security headers configured
- Input sanitization implemented
- Protection against common attacks
- Error handling for security violations
Definition of Done
- PR reviewed & merged
- GitHub Actions pipeline passes (lint → build → smoke)