swap backend to rust

backend/src/routes/mod.rs

@@ -0,0 +1,19 @@
+use axum::Router;
+use axum::routing::{get, post};
+use std::sync::mpsc;
+
+mod healthcheck;
+mod shutdown;
+
+use healthcheck::healthcheck;
+use shutdown::shutdown;
+
+pub fn app() -> (Router, mpsc::Receiver<bool>) {
+    let (tx, rx) = mpsc::channel();
+    (
+        Router::new()
+            .route("/healthcheck", get(healthcheck))
+            .route("/shutdown", post(move || shutdown(tx.clone()))),
+        rx,
+    )
+}