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ASP.NET Minimal API endpoints with automatic OpenAPI/Swagger documentation and strong typing. \n \n Organize endpoints using MapGroup() , endpoint filters, and feature-based folder structures for scalability \n Define explicit request/response DTOs with validation attributes; use record types and TypedResults for type safety \n Leverage .NET 9 built-in OpenAPI support with operation summaries, descriptions, operationIds, and property-level documentation via [Description()] \n Apply document and