new file: serv_nginx/api_bb/internal/handlers/user_workout_handler.go
modified: serv_nginx/api_bb/internal/models/workout.go
modified: serv_nginx/api_bb/internal/repository/workout_repository.go
modified: serv_nginx/api_bb/internal/routes/routes.go
new file: serv_nginx/api_bb/internal/service/user_workout_service.go
new file: serv_nginx/api_bb/pkg/utils/response.go
new file: serv_nginx/api_bb/pkg/utils/validation.go
add workout EndPoints for workout struct, CRUD operations and logics
