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/dashboard.ts

@@ -1,6 +1,8 @@
 import apiClient from './client'
 import { cachedRequest, buildCacheKey } from '@/utils/cache'
 
+const REQUEST_DETAIL_PREFETCH_TTL_MS = 5_000
+
 export interface DashboardStat {
   name: string
   value: string
@@ -360,11 +362,30 @@ export const dashboardApi = {
 
   // 获取请求详情
   // NOTE: This method now calls the new RESTful API at /api/admin/usage/{id}
-  async getRequestDetail(requestId: string, options: { includeBodies?: boolean } = {}): Promise<RequestDetail> {
-    const response = await apiClient.get<RequestDetail>(`/api/admin/usage/${requestId}`, {
-      params: { include_bodies: options.includeBodies ?? true },
+  async getRequestDetail(
+    requestId: string,
+    options: { includeBodies?: boolean, cacheTtlMs?: number } = {}
+  ): Promise<RequestDetail> {
+    const includeBodies = options.includeBodies ?? true
+    const cacheTtlMs = options.cacheTtlMs ?? 0
+    const cacheKey = buildCacheKey('dashboard:request-detail', { requestId, includeBodies })
+    return cachedRequest(
+      cacheKey,
+      async () => {
+        const response = await apiClient.get<RequestDetail>(`/api/admin/usage/${requestId}`, {
+          params: { include_bodies: includeBodies },
+        })
+        return response.data
+      },
+      cacheTtlMs
+    )
+  },
+
+  async prefetchRequestDetail(requestId: string): Promise<void> {
+    await dashboardApi.getRequestDetail(requestId, {
+      includeBodies: false,
+      cacheTtlMs: REQUEST_DETAIL_PREFETCH_TTL_MS
     })
-    return response.data
   },
 
   // 获取每日统计数据