feat(presentation): add utoipa::path annotations to all handlers

crates/presentation/src/handlers/health.rs

@@ -1,6 +1,7 @@
 use axum::{extract::State, Json};
 use crate::state::AppState;
 
+#[utoipa::path(get, path = "/health", responses((status = 200, description = "Service health status")))]
 pub async fn health_handler(State(s): State<AppState>) -> Json<serde_json::Value> {
     let db_ok = s.users.list_with_stats().await.is_ok();
     Json(serde_json::json!({