feat: provider api_formats 可空继承、OpenAI 图片 edit/variation 与用量配额多项补强

- 鉴权: provider_api_keys.api_formats 改为可空，OAuth 托管 key 自动继承 provider endpoints 激活格式，相关 handler/测试同步更新
- 图片 planner: OpenAI 图片路由新增 edit/variation 操作并完善参数校验、响应合并与流式处理
- 用量: user me usage 返回区分 client_requested_stream/upstream_is_stream，前端 usage 列表筛选与展示增强
- 统计: stats_daily_model 新增 cache_creation_ephemeral_5m/1h tokens 字段与回填链路
- 配额/observability: quota repository 新增内存与 SQL 扩展，admin observability usage 字段扩充
- 其它: OAuth 导入/轮询收敛、provider 汇总与 pool admin 读写链路小修、新增 system_config 缓存与 provider template handler

Closes #318

Co-authored-by: Entropy.Xu <[email protected]>

frontend/src/features/usage/composables/useUsageFilters.ts

@@ -1,6 +1,6 @@
 import { ref, computed, type Ref } from 'vue'
 import type { UsageRecord, FilterStatusValue } from '../types'
-import { hasUsageFallback, isUsageRecordFailed } from '../utils/status'
+import { hasUsageFallback, isUsageRecordFailed, isUsageUpstreamStream } from '../utils/status'
 
 export interface UseUsageFiltersOptions {
   /** 所有记录的响应式引用 */
@@ -65,11 +65,11 @@ export function useUsageFilters(options: UseUsageFiltersOptions) {
     if (filterStatus.value !== '__all__') {
       if (filterStatus.value === 'stream') {
         records = records.filter(record =>
-          record.is_stream && !isUsageRecordFailed(record)
+          isUsageUpstreamStream(record) && !isUsageRecordFailed(record)
         )
       } else if (filterStatus.value === 'standard') {
         records = records.filter(record =>
-          !record.is_stream && !isUsageRecordFailed(record)
+          !isUsageUpstreamStream(record) && !isUsageRecordFailed(record)
         )
       } else if (filterStatus.value === 'active') {
         records = records.filter(record =>