feat: add storage management and utility functions

- Implement storage service for file management
- Add support for external and system storage backends
- Include utility functions for environment variables
- Add hash utilities for secure operations
- Implement validation utilities for data integrity
- Support file encryption and secure storage
- Add proper error handling and logging for storage operations

utils/env.go

@@ -0,0 +1,11 @@
+package utils
+
+import "os"
+
+// GetEnv gets an environment variable with a fallback value
+func GetEnv(key, fallback string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return fallback
+}