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 <53283266+Entropy-Xu@users.noreply.github.com>

frontend/src/views/shared/Usage.vue

@@ -147,7 +147,11 @@ import {
   getDateRangeFromPeriod
 } from '@/features/usage/composables'
 import { reconcileActiveRequestDiscovery } from '@/features/usage/utils/activeRequestDiscovery'
-import { hasUsageFallback, isUsageRecordFailed } from '@/features/usage/utils/status'
+import {
+  hasUsageFallback,
+  isUsageRecordFailed,
+  isUsageUpstreamStream
+} from '@/features/usage/utils/status'
 import type { DateRangeParams, FilterStatusValue } from '@/features/usage/types'
 import type { UserOption } from '@/features/usage/components/UsageRecordsTable.vue'
 import { log } from '@/utils/logger'
@@ -334,11 +338,11 @@ const filteredRecords = computed(() => {
     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 =>
@@ -440,6 +444,18 @@ async function pollActiveRequests() {
         record.rate_multiplier = update.rate_multiplier ?? undefined
         record.response_time_ms = update.response_time_ms ?? undefined
         record.first_byte_time_ms = update.first_byte_time_ms ?? undefined
+        if (typeof update.upstream_is_stream === 'boolean') {
+          record.upstream_is_stream = update.upstream_is_stream
+          record.is_stream = update.upstream_is_stream
+        } else if (typeof update.is_stream === 'boolean') {
+          record.is_stream = update.is_stream
+        }
+        if (typeof update.client_is_stream === 'boolean') {
+          record.client_is_stream = update.client_is_stream
+          record.client_requested_stream = update.client_is_stream
+        } else if (typeof update.client_requested_stream === 'boolean') {
+          record.client_requested_stream = update.client_requested_stream
+        }
         // API 格式/格式转换：streaming 时已可确定，轮询时同步更新
         if (update.api_format != null) record.api_format = update.api_format
         if (update.endpoint_api_format != null) record.endpoint_api_format = update.endpoint_api_format