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/card-CIfC-8Rh.js

@@ -0,0 +1 @@
+import{j as r,a0 as s}from"./index-Dmami9WE.js";function d({className:a,...t}){return r.jsx("div",{"code-path":"src/components/ui/card.tsx:7:5","data-slot":"card",className:s("bg-card text-card-foreground flex flex-col gap-6 rounded-xl border py-6 shadow-sm",a),...t})}function e({className:a,...t}){return r.jsx("div",{"code-path":"src/components/ui/card.tsx:20:5","data-slot":"card-header",className:s("@container/card-header grid auto-rows-min grid-rows-[auto_auto] items-start gap-2 px-6 has-data-[slot=card-action]:grid-cols-[1fr_auto] [.border-b]:pb-6",a),...t})}function c({className:a,...t}){return r.jsx("div",{"code-path":"src/components/ui/card.tsx:33:5","data-slot":"card-title",className:s("leading-none font-semibold",a),...t})}function n({className:a,...t}){return r.jsx("div",{"code-path":"src/components/ui/card.tsx:43:5","data-slot":"card-description",className:s("text-muted-foreground text-sm",a),...t})}function i({className:a,...t}){return r.jsx("div",{"code-path":"src/components/ui/card.tsx:66:5","data-slot":"card-content",className:s("px-6",a),...t})}export{d as C,i as a,e as b,c,n as d};