API architecture rework

[Pandetthe]

Refactor the entire codebase to improve maintainability and simplify the addition of new features. The rework should include:

• Splitting the application into four projects:
  • API: Responsible for handling incoming requests and providing responses.
  • Infrastructure: Contains implementation details such as database access, external services, etc.
  • Application: Manages the business logic and application workflows.
  • Domain: Defines the core domain models and business rules.
• Adopting Pragmatic Clean Architecture principles to create a clear separation of concerns and better project reference management.
• Implementing Vertical Slices to ensure each feature is self-contained and modular.
• Using CQRS to separate read and write operations for better scalability and clarity.