feat(pool): 批量操作对话框改为服务端分页筛选，新增凭据导出功能

- 批量操作对话框从全量加载改为服务端分页+筛选，支持搜索和快捷选择器的服务端过滤
- 新增 resolve-selection API，支持"全选筛选结果"时解析完整匹配列表
- 新增批量导出凭据功能（仅 OAuth 账号），并发下载后导出为 JSON 文件
- 将快捷选择器和全文搜索的匹配逻辑从前端迁移到后端，统一复用
- 提取 pool key 序列化与过滤的公共函数，消除 AdminListPoolKeysAdapter 中的重复代码
- entrypoint.sh 增加 PostgreSQL 就绪等待，避免数据库未启动时迁移失败

frontend/src/api/endpoints/pool.ts

@@ -169,6 +169,24 @@ export interface PoolKeysQuery {
   page_size?: number
   search?: string
   status?: 'all' | 'active' | 'cooldown' | 'inactive'
+  quick_selectors?: string[]
+  search_scope?: 'name' | 'full'
+}
+
+export interface PoolKeySelectionRequest {
+  search?: string
+  quick_selectors?: string[]
+}
+
+export interface PoolKeySelectionItem {
+  key_id: string
+  key_name: string
+  auth_type: string
+}
+
+export interface PoolKeySelectionResponse {
+  total: number
+  items: PoolKeySelectionItem[]
 }
 
 export interface PoolBatchAction {
@@ -203,13 +221,29 @@ export async function listPoolKeys(
   providerId: string,
   params: PoolKeysQuery = {},
 ): Promise<PoolKeysPageResponse> {
-  const key = `pool:keys:${providerId}|${params.page ?? ''}|${params.page_size ?? ''}|${params.search ?? ''}|${params.status ?? ''}`
+  const normalizedParams = {
+    ...params,
+    quick_selectors: params.quick_selectors?.length ? params.quick_selectors.join(',') : undefined,
+  }
+  const key = `pool:keys:${providerId}|${normalizedParams.page ?? ''}|${normalizedParams.page_size ?? ''}|${normalizedParams.search ?? ''}|${normalizedParams.status ?? ''}|${normalizedParams.quick_selectors ?? ''}|${normalizedParams.search_scope ?? ''}`
   return dedupedRequest(key, async () => {
-    const response = await client.get<PoolKeysPageResponse>(`/api/admin/pool/${providerId}/keys`, { params })
+    const response = await client.get<PoolKeysPageResponse>(`/api/admin/pool/${providerId}/keys`, { params: normalizedParams })
     return response.data
   })
 }
 
+export async function resolvePoolKeySelection(
+  providerId: string,
+  body: PoolKeySelectionRequest,
+): Promise<PoolKeySelectionResponse> {
+  const response = await client.post<PoolKeySelectionResponse>(
+    `/api/admin/pool/${providerId}/keys/resolve-selection`,
+    body,
+    { timeout: POOL_BATCH_ACTION_TIMEOUT_MS },
+  )
+  return response.data
+}
+
 export async function batchActionPoolKeys(
   providerId: string,
   body: PoolBatchAction,