Add Security Headers & Rate Limiting

Description

Implement security headers and rate limiting for API protection.

Acceptance Criteria

  • SecurityHeaders middleware created
  • X-Frame-Options, X-Content-Type-Options, etc. set
  • Rate limiting configured (60 per minute)
  • Middleware registered in Kernel.php
  • Security headers verified in responses

Implementation Steps

  1. php artisan make:middleware SecurityHeaders
  2. Implement security headers
  3. Register in Kernel.php
  4. Configure rate limiting in RouteServiceProvider
  5. Test with curl

Reference

  • Roadmap: docs/roadmaps/Implementation_Roadmap_Backend.md Phase 9, Step 17
  • Standards: backend/CLAUDE.md - Security section

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