refactor: reorganize struct fields, add new handlers and storage backends

- [x] Reorder struct fields across codebase for consistency
- [x] Add analytics event handlers and tests
- [x] Add authentication API key management handlers and tests
- [x] Add pre-warming control handlers and tests
- [x] Implement S3 storage backend with tests
- [x] Implement SMB/CIFS storage backend with tests
- [x] Add CDN middleware tests
- [x] Integrate analytics tracking into cache manager
- [x] Add S3 and SMB storage initialization in app setup
- [x] Add CDN caching to proxy handlers
- [x] Remove distributed locking (Redis lock manager)
- [x] Remove proxy common package and utilities
- [x] Remove standalone HTTP server package
- [x] Remove logger middleware
- [x] Simplify error handling utilities
- [x] Update config with S3 and SMB options
- [x] Update cache manager signature to include analytics

pkg/errors/codes.go

@@ -58,11 +58,3 @@ var HTTPStatusCode = map[string]int{
 	ErrCodeServiceUnavailable: 503,
 	ErrCodeCircuitOpen:        503,
 }
-
-// GetHTTPStatus returns the HTTP status code for an error code
-func GetHTTPStatus(code string) int {
-	if status, ok := HTTPStatusCode[code]; ok {
-		return status
-	}
-	return 500 // Default to internal server error
-}