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/utils/__tests__/status.spec.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest'
 
 import {
+  formatUsageStreamLabel,
   hasUsageFallback,
   isUsageRecordFailed,
   isUsageRecordSuccessful,
@@ -98,6 +99,22 @@ describe('usage status helpers', () => {
     expect(hasUsageFallback(buildUsageRecord({ has_fallback: undefined }))).toBe(false)
   })
 
+  it('prefers symmetric stream aliases when present', () => {
+    expect(formatUsageStreamLabel(buildUsageRecord({
+      is_stream: true,
+      upstream_is_stream: true,
+      client_requested_stream: true,
+      client_is_stream: false,
+    }))).toBe('标准 -> 流式')
+  })
+
+  it('falls back to legacy stream fields when symmetric aliases are absent', () => {
+    expect(formatUsageStreamLabel(buildUsageRecord({
+      is_stream: true,
+      client_requested_stream: false,
+    }))).toBe('标准 -> 流式')
+  })
+
   it('uses status code only as a last fallback for timeline status', () => {
     expect(resolveTimelineFinalStatus({
       statusCode: 200,

frontend/src/features/usage/utils/status.ts

@@ -17,6 +17,52 @@ export function hasUsageFallback(
   return record.has_fallback === true
 }
 
+export function resolveUsageStreamModes(
+  record: Pick<
+    UsageRecord,
+    'is_stream' | 'upstream_is_stream' | 'client_requested_stream' | 'client_is_stream'
+  >
+): { clientRequestedStream: boolean, upstreamStream: boolean } {
+  const upstreamStream = typeof record.upstream_is_stream === 'boolean'
+    ? record.upstream_is_stream
+    : record.is_stream
+
+  return {
+    clientRequestedStream: typeof record.client_is_stream === 'boolean'
+      ? record.client_is_stream
+      : typeof record.client_requested_stream === 'boolean'
+        ? record.client_requested_stream
+        : upstreamStream,
+    upstreamStream
+  }
+}
+
+export function isUsageUpstreamStream(
+  record: Pick<
+    UsageRecord,
+    'is_stream' | 'upstream_is_stream' | 'client_requested_stream' | 'client_is_stream'
+  >
+): boolean {
+  return resolveUsageStreamModes(record).upstreamStream
+}
+
+export function formatUsageStreamLabel(
+  record: Pick<
+    UsageRecord,
+    'is_stream' | 'upstream_is_stream' | 'client_requested_stream' | 'client_is_stream'
+  >
+): string {
+  const { clientRequestedStream, upstreamStream } = resolveUsageStreamModes(record)
+  const clientLabel = clientRequestedStream ? '流式' : '标准'
+  const upstreamLabel = upstreamStream ? '流式' : '标准'
+
+  if (clientRequestedStream === upstreamStream) {
+    return clientLabel
+  }
+
+  return `${clientLabel} -> ${upstreamLabel}`
+}
+
 function hasTerminalSuccessStatusCode(
   record: Pick<UsageRecord, 'status_code'>
 ): boolean {