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/prewarming/worker.go

@@ -24,22 +24,22 @@ type Worker struct {
 	cache         *cache.Manager
 	analytics     *analytics.Engine
 	client        *network.Client
+	stopChan      chan struct{}
+	wg            sync.WaitGroup
 	interval      time.Duration
 	maxConcurrent int
 	enabled       bool
-	stopChan      chan struct{}
-	wg            sync.WaitGroup
 }
 
 // Config holds pre-warming worker configuration
 type Config struct {
-	Enabled       bool
-	Interval      time.Duration
-	MaxConcurrent int
-	TopPackages   int
 	CacheManager  *cache.Manager
 	Analytics     *analytics.Engine
 	NetworkClient *network.Client
+	Interval      time.Duration
+	MaxConcurrent int
+	TopPackages   int
+	Enabled       bool
 }
 
 // NewWorker creates a new pre-warming worker