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/network/client.go

@@ -24,23 +24,23 @@ type Client struct {
 
 // Config holds client configuration
 type Config struct {
-	Timeout         time.Duration // Request timeout
-	MaxRetries      int           // Max retry attempts
-	RetryDelay      time.Duration // Initial retry delay
-	RateLimit       float64       // Requests per second (0 = unlimited)
-	RateBurst       int           // Rate limiter burst
-	CircuitBreaker  CircuitBreakerConfig
 	UserAgent       string
+	CircuitBreaker  CircuitBreakerConfig
+	Timeout         time.Duration
+	MaxRetries      int
+	RetryDelay      time.Duration
+	RateLimit       float64
+	RateBurst       int
 	MaxConnsPerHost int
 }
 
 // RetryConfig holds retry configuration
 type RetryConfig struct {
+	FixedDelays  []time.Duration
 	MaxAttempts  int
 	InitialDelay time.Duration
 	MaxDelay     time.Duration
 	Multiplier   float64
-	FixedDelays  []time.Duration // If set, use these delays instead of exponential backoff
 }
 
 // CircuitBreakerConfig holds circuit breaker configuration
@@ -63,11 +63,11 @@ const (
 
 // CircuitBreaker implements the circuit breaker pattern
 type CircuitBreaker struct {
+	lastFailureTime time.Time
 	config          CircuitBreakerConfig
 	state           CircuitBreakerState
 	failures        int
 	successes       int
-	lastFailureTime time.Time
 	halfOpenCalls   int
 	mu              sync.RWMutex
 }

pkg/network/client_test.go

@@ -19,14 +19,14 @@ import (
 // TestClientGet tests the HTTP client Get method with various scenarios
 func TestClientGet(t *testing.T) {
 	tests := []struct {
-		name           string
 		serverBehavior func(*testing.T) *httptest.Server
-		config         network.Config
 		headers        map[string]string
-		wantErr        bool
-		errContains    string
 		validateBody   func(*testing.T, io.ReadCloser)
 		validateStatus func(*testing.T, int)
+		name           string
+		errContains    string
+		config         network.Config
+		wantErr        bool
 	}{
 		// GOOD: Successful GET request
 		{