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/app/handlers.go

@@ -500,11 +500,10 @@ func (a *App) handleInfo(c *fiber.Ctx) error {
 			"max_cache_size":   a.config.Cache.MaxSizeBytes,
 		},
 		"features": map[string]bool{
-			"distributed_locking": a.lockManager != nil,
-			"security_scanning":   a.config.Security.Enabled,
-			"pre_warming":         a.prewarmWorker != nil,
-			"websockets":          true,
-			"analytics":           true,
+			"security_scanning": a.config.Security.Enabled,
+			"pre_warming":       a.prewarmWorker != nil,
+			"websockets":        true,
+			"analytics":         true,
 		},
 	}