Clear VM statuses on Proxmox shutdown

src/gui.rs

@@ -556,6 +556,7 @@ impl eframe::App for App {
                                         s.add_log("✓ 关机命令发送成功");
                                         s.add_log(&format!("响应: {}", response));
                                         s.is_connected = false;
+                                        s.vm_statuses.clear();
                                     }
                                     Err(e) => {
                                         state.write().unwrap().add_log(&format!("✗ 关机失败: {}", e));