refactor(frontend): API 子模块化、大组件拆分与 TanStack Query hooks

P1: kubernetes/system API 拆为子目录模块，导出工具下沉到 lib/export-utils，
    http 统一 buildApiUrl/getWsBase；HostMonitor、DeploymentEdit* 拆至子组件。

P2: 新增 hooks/api（queryKeys、useTerminalSessions、useHostMonitor），
    TerminalSessionsTab 与 HostMonitor 接入 TanStack Query。

P3: 保留 services/api 路径，未迁移至 api/ 目录。

backend/static/assets/trash-2-DWVnIU6o.js

@@ -0,0 +1 @@
+import{i as a}from"./index-Dmami9WE.js";const t=[["path",{d:"M10 11v6",key:"nco0om"}],["path",{d:"M14 11v6",key:"outv1u"}],["path",{d:"M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6",key:"miytrc"}],["path",{d:"M3 6h18",key:"d0wm0j"}],["path",{d:"M8 6V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2",key:"e791ji"}]],o=a("trash-2",t);export{o as T};