perf(frontend): 收敛导航预取并去重首屏请求

- 导航预取仅保留 pointerdown 触发，移除 mouseenter/focus，避免鼠标划过误触发
- 后台预取只做组件懒加载，不再预取各页业务数据，减少首屏资源争抢
- 版本状态检查增加 sessionStorage 缓存（正常 20 分钟 / 错误 5 分钟 TTL）
- fetchModules、必读公告拉取增加请求去重，避免并发重复请求
- 更新检查改用可清理的定时器，组件卸载时清理
- UsageRecordsTable 搜索防抖改为自定义实现，卸载时取消挂起 emit 并补充测试

frontend/src/utils/adminNavigationPrefetch.ts

@@ -1,95 +1,30 @@
-import { adminWalletApi } from '@/api/admin-wallets'
-import { adminApi } from '@/api/admin'
-import { adminBillingPlansApi, epayGatewayApi } from '@/api/billing'
-import { getProvidersSummary } from '@/api/endpoints/providers'
-import { getPoolOverview, getPoolSchedulingPresets, listPoolKeys } from '@/api/endpoints/pool'
-import { listGlobalModels } from '@/api/global-models'
-import { listRoutingGroups } from '@/api/routing-profiles'
-import { usersApi } from '@/api/users'
 import { log } from '@/utils/logger'
 
-const NAV_DATA_CACHE_TTL_MS = 10 * 1000
-const NAV_SYSTEM_CONFIG_CACHE_TTL_MS = 30 * 1000
-const NAV_POOL_PRESETS_CACHE_TTL_MS = 5 * 60 * 1000
 const PREFETCH_COOLDOWN_MS = 5 * 1000
 
 const lastPrefetchAt = new Map<string, number>()
 
 const adminRouteWarmers: Record<string, () => Promise<void>> = {
   '/admin/users': async () => {
-    await Promise.allSettled([
-      import('@/views/admin/Users.vue'),
-      usersApi.getAllUsers({ cacheTtlMs: NAV_DATA_CACHE_TTL_MS }),
-      adminWalletApi.listAllWallets(
-        { owner_type: 'user' },
-        { cacheTtlMs: NAV_DATA_CACHE_TTL_MS },
-      ),
-    ])
+    await import('@/views/admin/Users.vue')
   },
   '/admin/providers': async () => {
-    await Promise.allSettled([
-      import('@/views/admin/ProviderManagement.vue'),
-      getProvidersSummary(
-        { page: 1, page_size: 20 },
-        { cacheTtlMs: NAV_DATA_CACHE_TTL_MS },
-      ),
-      adminApi.getSystemConfig('provider_priority_mode', {
-        cacheTtlMs: NAV_SYSTEM_CONFIG_CACHE_TTL_MS,
-      }),
-      listGlobalModels(
-        { is_active: true, limit: 1000 },
-        { cacheTtlMs: NAV_DATA_CACHE_TTL_MS },
-      ),
-    ])
+    await import('@/views/admin/ProviderManagement.vue')
   },
   '/admin/models': async () => {
-    await Promise.allSettled([
-      import('@/views/admin/ModelManagement.vue'),
-      listGlobalModels(
-        { skip: 0, limit: 20 },
-        { cacheTtlMs: NAV_DATA_CACHE_TTL_MS },
-      ),
-    ])
+    await import('@/views/admin/ModelManagement.vue')
   },
   '/admin/routing': async () => {
-    await Promise.allSettled([
-      import('@/views/admin/RoutingProfiles.vue'),
-      listRoutingGroups(),
-    ])
+    await import('@/views/admin/RoutingProfiles.vue')
   },
   '/admin/pool': async () => {
-    const [overviewResult] = await Promise.allSettled([
-      getPoolOverview({ cacheTtlMs: NAV_DATA_CACHE_TTL_MS }),
-      getPoolSchedulingPresets({ cacheTtlMs: NAV_POOL_PRESETS_CACHE_TTL_MS }),
-      import('@/views/admin/PoolManagement.vue'),
-    ])
-
-    if (overviewResult.status !== 'fulfilled') {
-      return
-    }
-
-    const firstProviderId = overviewResult.value.items.find(item => item.pool_enabled)?.provider_id
-    if (!firstProviderId) {
-      return
-    }
-
-    await listPoolKeys(
-      firstProviderId,
-      { page: 1, page_size: 50, status: 'all' },
-      { cacheTtlMs: NAV_DATA_CACHE_TTL_MS },
-    )
+    await import('@/views/admin/PoolManagement.vue')
   },
   '/admin/payment-gateways': async () => {
-    await Promise.allSettled([
-      import('@/views/admin/PaymentGatewaySettings.vue'),
-      epayGatewayApi.get(),
-    ])
+    await import('@/views/admin/PaymentGatewaySettings.vue')
   },
   '/admin/billing-plans': async () => {
-    await Promise.allSettled([
-      import('@/views/admin/BillingPlansManagement.vue'),
-      adminBillingPlansApi.list(),
-    ])
+    await import('@/views/admin/BillingPlansManagement.vue')
   },
 }