Can you explain the concept of clean architecture and its main principles?

Clean architecture is an approach to software design that divides the system into layers with clear responsibilities and aims to separate business logic from implementation details (UI, databases, frameworks).

Main principles:

• Layer separation: Typically, layers include Entities, Use Cases, Interface Adapters (for UI, databases), Frameworks & Drivers (external libraries, UI).
• Dependencies point inward: External layers depend on internal ones, and internal layers are unaware of external ones.
• Independence from UI and infrastructure: Business logic should not depend on specific technologies or UI.
• Testability: Thanks to separation and loose coupling, business logic is easy to cover with tests.

In Flutter, this helps separate widgets and UI from business logic and data, making the code more maintainable and scalable.