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/phone-Cn_wSobp.js

@@ -0,0 +1 @@
+import{i as a}from"./index-Dmami9WE.js";const o=[["path",{d:"m22 7-8.991 5.727a2 2 0 0 1-2.009 0L2 7",key:"132q7q"}],["rect",{x:"2",y:"4",width:"20",height:"16",rx:"2",key:"izxlao"}]],c=a("mail",o);const e=[["path",{d:"M13.832 16.568a1 1 0 0 0 1.213-.303l.355-.465A2 2 0 0 1 17 15h3a2 2 0 0 1 2 2v3a2 2 0 0 1-2 2A18 18 0 0 1 2 4a2 2 0 0 1 2-2h3a2 2 0 0 1 2 2v3a2 2 0 0 1-.8 1.6l-.468.351a1 1 0 0 0-.292 1.233 14 14 0 0 0 6.392 6.384",key:"9njp5v"}]],i=a("phone",e);export{c as M,i as P};