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/models/components/GlobalModelFormDialog.vue

@@ -764,14 +764,14 @@ async function handleSubmit() {
     return
   }
 
-  if (!tieredPricing.value?.tiers?.length) {
+  const finalTiers = tieredPricingEditorRef.value?.getFinalTiers()
+  const finalTieredPricing = finalTiers ? { tiers: finalTiers } : tieredPricing.value
+
+  if (!finalTieredPricing?.tiers?.length) {
     showError('请配置至少一个价格阶梯')
     return
   }
 
-  const finalTiers = tieredPricingEditorRef.value?.getFinalTiers()
-  const finalTieredPricing = finalTiers ? { tiers: finalTiers } : tieredPricing.value
-
   // Apply billing (video) pricing into config before cleaning/submitting.
   applyVideoPricingToConfig()