feat(presentation): handlers, OpenAPI/Scalar, routes, extractors

crates/presentation/src/handlers/health.rs

@@ -0,0 +1,7 @@
+use axum::{http::StatusCode, Json};
+use serde_json::json;
+
+#[utoipa::path(get, path = "/health", responses((status = 200, description = "Service is healthy")))]
+pub async fn health() -> (StatusCode, Json<serde_json::Value>) {
+    (StatusCode::OK, Json(json!({ "status": "ok" })))
+}