style(v0.3): rustfmt power FSM/service/integration

Прогон cargo fmt (гейт lint): многострочное форматирование match-веток FSM,
PowerMock/PowerService-литералов, integration-вызовов. Без изменений логики.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Alexander <akotenev2003@gmail.com>

crates/core/shturman-power/tests/integration.rs

@@ -55,8 +55,16 @@ async fn shutdown_imminent_then_abort() {
     let svc = PowerService::new();
     let mock = svc.mock();
     let server = zbus::Connection::session().await.unwrap();
-    server.object_server().at(names::power::PATH, svc).await.unwrap();
-    server.object_server().at(names::power::PATH, mock).await.unwrap();
+    server
+        .object_server()
+        .at(names::power::PATH, svc)
+        .await
+        .unwrap();
+    server
+        .object_server()
+        .at(names::power::PATH, mock)
+        .await
+        .unwrap();
     server.request_name(names::power::NAME).await.unwrap();
 
     let client = zbus::Connection::session().await.unwrap();