feat: add health check endpoint and update Docker Compose healthcheck configuration

backend/src/router.rs

@@ -1,4 +1,4 @@
-use axum::{middleware, routing::{delete, get, post, put}, Router};
+use axum::{http::StatusCode, middleware, routing::{delete, get, post, put}, Router};
 use sqlx::PgPool;
 use std::sync::Arc;
 use tower_http::{cors::CorsLayer, trace::TraceLayer};
@@ -34,6 +34,10 @@ pub struct AppState {
     pub config: Config,
 }
 
+async fn health_handler() -> StatusCode {
+    StatusCode::OK
+}
+
 /// Constrói o router Axum com todas as rotas e middlewares.
 pub fn build(db: PgPool, config: Config) -> Router {
     let db = Arc::new(db);
@@ -112,6 +116,7 @@ pub fn build(db: PgPool, config: Config) -> Router {
         .route_layer(middleware::from_fn_with_state(state.clone(), auth_middleware));
 
     Router::new()
+        .route("/health", get(health_handler))
         .nest("/api/v1", public_routes.merge(protected_routes))
         .with_state(state)
         .layer(TraceLayer::new_for_http())