adding user authentication

src/application/services/file_retrieval_service.rs

@@ -18,6 +18,13 @@ impl FileRetrievalService {
     pub fn new(file_repository: Arc<dyn FileReadPort>) -> Self {
         Self { file_repository }
     }
+    
+    /// Crea un stub para pruebas
+    pub fn default_stub() -> Self {
+        Self {
+            file_repository: Arc::new(crate::infrastructure::repositories::FileFsReadRepository::default_stub())
+        }
+    }
 }
 
 #[async_trait]