feat: Provider 摘要 API 改为服务端分页，支持搜索和筛选

- 后端 /summary 接口新增 page/page_size/search/status/api_format/model_id 参数
- 新增 ProviderSummaryPageResponse 分页响应模型
- 前端 useProviderFilters 从客户端筛选改为构建服务端查询参数
- ProviderManagement 通过 watch queryParams 实现分页/筛选联动，搜索 debounce 300ms
- PriorityManagementDialog 改为对话框打开时自行加载全量 providers
- 其他使用方(StandaloneKeyFormDialog/UserFormDialog/ReplayDialog/ModelManagement)适配新接口

frontend/src/features/usage/components/ReplayDialog.vue

@@ -388,8 +388,8 @@ watch(() => props.isOpen, async (isOpen) => {
     showRequestHeaders.value = false
     showResponseHeaders.value = false
     try {
-      const summary = await getProvidersSummary()
-      providers.value = summary
+      const response = await getProvidersSummary({ page_size: 9999 })
+      providers.value = response.items
         .filter(p => p.is_active && p.active_endpoints > 0)
         .map(p => ({ id: p.id, name: p.name }))
     } catch (e) {