migrated backend structure to Axum API setup, added core modules (models, services, api), integrated dotenv for configuration management, and added project roadmap for future phases

backend-rust/src/api.rs

@@ -0,0 +1,3 @@
+mod handlers;
+mod middleware;
+mod routes;

backend-rust/src/models.rs

@@ -0,0 +1,3 @@
+mod article;
+mod summary;
+mod user;

backend-rust/src/services.rs

@@ -0,0 +1,2 @@
+mod summary_service;
+mod news_service;