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/hard-drive-DmC04Y5r.js

@@ -0,0 +1 @@
+import{i as e}from"./index-Dmami9WE.js";const y=[["line",{x1:"22",x2:"2",y1:"12",y2:"12",key:"1y58io"}],["path",{d:"M5.45 5.11 2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z",key:"oot6mr"}],["line",{x1:"6",x2:"6.01",y1:"16",y2:"16",key:"sgf278"}],["line",{x1:"10",x2:"10.01",y1:"16",y2:"16",key:"1l4acy"}]],a=e("hard-drive",y);export{a as H};