Service Layer Extractor Extract business logic from controllers into a testable service layer. Architecture Layers Before: Fat Controller After: Service Layer Dependency Injection Testing Services Folder Structure Migration Strategy Benefits - Testability : Services testable without HTTP - Reusability : Logic reused across endpoints - Separation : Clear boundaries between layers - Maintainability : Easier to locate and modify logic Output Checklist - [ ] Service classes created - [ ] Business logic extracted from controllers - [ ] Repository layer for data access - [ ] Dependency injection se…