Refactor FastAPI Codebase to Follow Hexagonal/Clean Architecture

[Arghya721]

Issue Description:

The current FastAPI codebase must be refactored to follow a more structured and maintainable architecture, such as Hexagonal or Clean Architecture. This will involve reorganizing the existing code to ensure separation of concerns, improve testability, and enhance the flexibility to adapt to future changes.

Tasks:

• Identify core components of the FastAPI application (e.g., routes, services, repositories, etc.).
• Define boundaries and layers in accordance with Hexagonal or Clean Architecture principles.
• Refactor existing code to align with the chosen architecture, ensuring minimal disruption to current functionality.
• Update or create new unit tests to cover the refactored components.
• Document the new architecture and code structure to guide future development.

Expected Outcome:

• A well-organized codebase with clear separation between different layers (e.g., domain, application, infrastructure).
• Improved maintainability and scalability of the FastAPI application.
• Comprehensive documentation to support ongoing and future development efforts.