refactor(frontend): P1-P2 架构统一 — utils/hooks/api 模块化

P1:
- utils/storage.ts、theme.ts、validate.ts + index 统一出口
- request/store/useTheme 接入 storage；清零 confirm/alert
- PipelineManager、TerminalAuditTab 拆分子模块（<700行红线）

P2:
- api/monitor、api/deploy 子目录化
- hooks/api 扩展：servers/pipelines/alerts/audit/sessionCommands
- PipelineManager、AuditOperationsTab 接入 TanStack Query

frontend/src/utils/storage.ts

@@ -0,0 +1,51 @@
+// 本地存储封装 — token / 通用 KV // Logan.Li
+
+import { useUserStore } from '@/store';
+
+export const STORAGE_KEYS = {
+  token: 'token',
+  theme: 'aiops-theme',
+  user: 'user-storage',
+} as const;
+
+export function getItem(key: string): string | null {
+  if (typeof window === 'undefined') return null;
+  try {
+    return localStorage.getItem(key);
+  } catch {
+    return null;
+  }
+}
+
+export function setItem(key: string, value: string): void {
+  if (typeof window === 'undefined') return;
+  try {
+    localStorage.setItem(key, value);
+  } catch {
+    /* ignore quota errors */
+  }
+}
+
+export function removeItem(key: string): void {
+  if (typeof window === 'undefined') return;
+  try {
+    localStorage.removeItem(key);
+  } catch {
+    /* ignore */
+  }
+}
+
+/** 读取 JWT — zustand 优先，localStorage 兜底 // Logan.Li */
+export function getToken(): string {
+  return useUserStore.getState().token || getItem(STORAGE_KEYS.token) || '';
+}
+
+export function setToken(token: string): void {
+  setItem(STORAGE_KEYS.token, token);
+  useUserStore.getState().setToken(token);
+}
+
+export function clearToken(): void {
+  removeItem(STORAGE_KEYS.token);
+  useUserStore.getState().setToken(null);
+}