perf: 全栈查询优化、前端缓存去重与页面可见性优化

后端:
- SQL count 查询统一改用 func.count() 子查询替代 query.count()
- Dashboard/Audit 等页面多次独立查询合并为单次聚合查询
- Provider summary 列表改为批量查询消除 N+1 问题
- DailyStats 逐天循环查询改为 CASE 分桶单次查询
- 使用 load_only() 减少不必要的列加载
- cache_decorator 支持嵌套属性路径解析(dotted vary_by)
- 多个管理/公共端点新增 @cache_result 缓存装饰

前端:
- cache.ts 新增 in-flight 请求复用、dedupedRequest、buildCacheKey
- 大量 API 调用添加前端缓存或去重
- 多个页面定时器在标签页隐藏时暂停、可见时恢复
- Auth 检查从 setInterval 改为 storage + visibilitychange 事件驱动
- 请求竞态防护(requestId 模式)

数据库:
- Usage 表新增 idx_usage_status_user_created 复合索引

frontend/src/api/endpoints/global-models.ts

@@ -1,4 +1,5 @@
 import client from '../client'
+import { dedupedRequest, buildCacheKey } from '@/utils/cache'
 import type {
   GlobalModelCreate,
   GlobalModelUpdate,
@@ -27,16 +28,21 @@ export async function getGlobalModels(params?: {
   is_active?: boolean
   search?: string
 }): Promise<GlobalModelListResponse> {
-  const response = await client.get('/api/admin/models/global', { params })
-  return response.data
+  const key = buildCacheKey('global-models:list', params as Record<string, unknown> | undefined)
+  return dedupedRequest(key, async () => {
+    const response = await client.get('/api/admin/models/global', { params })
+    return response.data
+  })
 }
 
 /**
  * 获取单个 GlobalModel 详情
  */
 export async function getGlobalModel(id: string): Promise<GlobalModelWithStats> {
-  const response = await client.get(`/api/admin/models/global/${id}`)
-  return response.data
+  return dedupedRequest(`global-models:detail:${id}`, async () => {
+    const response = await client.get(`/api/admin/models/global/${id}`)
+    return response.data
+  })
 }
 
 /**
@@ -112,10 +118,12 @@ export async function getGlobalModelProviders(globalModelId: string): Promise<{
   providers: ModelCatalogProviderDetail[]
   total: number
 }> {
-  const response = await client.get(
-    `/api/admin/models/global/${globalModelId}/providers`
-  )
-  return response.data
+  return dedupedRequest(`global-models:providers:${globalModelId}`, async () => {
+    const response = await client.get(
+      `/api/admin/models/global/${globalModelId}/providers`
+    )
+    return response.data
+  })
 }
 
 /**

frontend/src/api/endpoints/pool.ts

@@ -1,4 +1,5 @@
 import client from '../client'
+import { dedupedRequest } from '@/utils/cache'
 import type { AllowedModels, ProxyConfig } from './types/provider'
 
 export interface PoolKeyStatus {
@@ -175,16 +176,21 @@ export interface PoolBatchAction {
 }
 
 export async function getPoolOverview(): Promise<PoolOverviewResponse> {
-  const response = await client.get('/api/admin/pool/overview')
-  return response.data
+  return dedupedRequest('pool:overview', async () => {
+    const response = await client.get<PoolOverviewResponse>('/api/admin/pool/overview')
+    return response.data
+  })
 }
 
 export async function listPoolKeys(
   providerId: string,
   params: PoolKeysQuery = {},
 ): Promise<PoolKeysPageResponse> {
-  const response = await client.get(`/api/admin/pool/${providerId}/keys`, { params })
-  return response.data
+  const key = `pool:keys:${providerId}|${params.page ?? ''}|${params.page_size ?? ''}|${params.search ?? ''}|${params.status ?? ''}`
+  return dedupedRequest(key, async () => {
+    const response = await client.get<PoolKeysPageResponse>(`/api/admin/pool/${providerId}/keys`, { params })
+    return response.data
+  })
 }
 
 export async function batchActionPoolKeys(

frontend/src/api/endpoints/providers.ts

@@ -1,4 +1,5 @@
 import client from '../client'
+import { dedupedRequest } from '@/utils/cache'
 import type {
   ClaudeCodeAdvancedConfig,
   FailoverRulesConfig,
@@ -11,16 +12,20 @@ import type {
  * 获取 Providers 摘要（包含 Endpoints 统计）
  */
 export async function getProvidersSummary(): Promise<ProviderWithEndpointsSummary[]> {
-  const response = await client.get('/api/admin/providers/summary')
-  return response.data
+  return dedupedRequest('providers:summary', async () => {
+    const response = await client.get<ProviderWithEndpointsSummary[]>('/api/admin/providers/summary')
+    return response.data
+  })
 }
 
 /**
  * 获取单个 Provider 的详细信息
  */
 export async function getProvider(providerId: string): Promise<ProviderWithEndpointsSummary> {
-  const response = await client.get(`/api/admin/providers/${providerId}/summary`)
-  return response.data
+  return dedupedRequest(`providers:detail:${providerId}`, async () => {
+    const response = await client.get<ProviderWithEndpointsSummary>(`/api/admin/providers/${providerId}/summary`)
+    return response.data
+  })
 }
 
 /**
@@ -214,6 +219,8 @@ export interface ProviderMappingPreviewResponse {
 export async function getProviderMappingPreview(
   providerId: string
 ): Promise<ProviderMappingPreviewResponse> {
-  const response = await client.get(`/api/admin/providers/${providerId}/mapping-preview`)
-  return response.data
+  return dedupedRequest(`providers:mapping-preview:${providerId}`, async () => {
+    const response = await client.get<ProviderMappingPreviewResponse>(`/api/admin/providers/${providerId}/mapping-preview`)
+    return response.data
+  })
 }