feat: enhance security logging and ensure rate limit blocks are properly tracked

- Add comprehensive logging for rate limit blocks with full request details
  - IP address (with proper proxy detection), user agent, headers, timestamps
  - Rate limit info (current count, limit, remaining, reset time)
  - Separate tracking for auth vs general endpoints

- Enhance authentication failure logging
  - JWT validation failures with detailed error info
  - Admin auth attempts without token
  - Failed token validation with user context
  - All events include IP, path, method, user agent

- Improve Winston logger configuration for production
  - Add automatic log rotation (10MB errors, 50MB combined)
  - Create separate security.log for auth/rate limit events
  - Ensure logs directory exists automatically
  - Add structured JSON format for log aggregation
  - Support container logging with LOG_TO_CONSOLE env var

- Create comprehensive documentation
  - Security logging guide with examples
  - Monitoring recommendations
  - Configuration reference

- Add test script to verify logging functionality

All rate limit settings remain configurable via admin panel:
- Window duration, max requests, auth limits
- Skip authenticated requests option
- Public endpoints only option

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/admin/index.ts

@@ -8,6 +8,7 @@ export { PhotoUpload } from './PhotoUpload';
 export { CategoryManager } from './CategoryManager';
 export { EventCategoryManager } from './EventCategoryManager';
 export { CMSEditor } from './CMSEditor';
+export { WelcomeMessageEditor } from './WelcomeMessageEditor';
 export { BulkArchiveModal } from './BulkArchiveModal';
 export { MaintenanceBanner } from './MaintenanceBanner';
 export { EmailPreviewModal } from './EmailPreviewModal';