perf: 并行化 admin 聚合路由并完善前端缓存预取

- gateway: usage detail / provider summary / pool overview / users list 改为 tokio join 并行拉取依赖数据
- usage: interval timeline 支持自动刷新并按查询区间动态展示，取消服务端 120 分钟过滤并在 ScatterChart 统一封顶
- frontend: 新增管理端导航预取工具及 SidebarNav/MainLayout 触发，admin 读接口统一走 cachedRequest 的短期缓存
- dashboard: request detail 支持短 TTL 缓存并在 UsageRecordsTable mousedown 时预取
- data: migrate 测试在 wait_for_postgres 失败时清理子进程，避免遗留

frontend/src/api/users.ts

@@ -1,4 +1,5 @@
 import apiClient from './client'
+import { cachedRequest } from '@/utils/cache'
 import type { UserSession as SessionRecord } from '@/types/session'
 
 export interface User {
@@ -70,9 +71,16 @@ export interface UpsertUserApiKeyRequest {
 export type UserSession = SessionRecord
 
 export const usersApi = {
-  async getAllUsers(): Promise<User[]> {
-    const response = await apiClient.get<User[]>('/api/admin/users')
-    return response.data
+  async getAllUsers(options: { cacheTtlMs?: number } = {}): Promise<User[]> {
+    const cacheTtlMs = options.cacheTtlMs ?? 0
+    return cachedRequest(
+      'admin:users:list',
+      async () => {
+        const response = await apiClient.get<User[]>('/api/admin/users')
+        return response.data
+      },
+      cacheTtlMs,
+    )
   },
 
   async getUser(userId: string): Promise<User> {