fix(account): address review on OpenAI quota auto-pause

- gate previous_response_id sticky path with quota auto-pause check at both
  the snapshot and DB-recheck stages (previously bypassed, #1)
- skip pausing when the usage window already reset to avoid a stale stuck-pause;
  carry codex_*_reset_at / reset_after_seconds / codex_usage_updated_at through
  the scheduler snapshot whitelist (#2)
- remove the incomplete limit mode; percentage threshold only (#3)
- add global default 5h/7d threshold inputs to the Ops settings dialog with
  validation and en/zh i18n (#4)
- downgrade account_auto_paused_by_quota log from Info to Debug; it fires
  per-candidate on the scheduling hot path (#5)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/api/admin/ops.ts

@@ -778,9 +778,15 @@ export interface OpsAlertRuntimeSettings {
   thresholds: OpsMetricThresholds // 指标阈值配置
 }
 
+export interface OpsOpenAIAccountQuotaAutoPauseSettings {
+  default_threshold_5h: number // 0~1，0 表示不启用全局默认 5h 阈值
+  default_threshold_7d: number // 0~1，0 表示不启用全局默认 7d 阈值
+}
+
 export interface OpsAdvancedSettings {
   data_retention: OpsDataRetentionSettings
   aggregation: OpsAggregationSettings
+  openai_account_quota_auto_pause: OpsOpenAIAccountQuotaAutoPauseSettings
   ignore_count_tokens_errors: boolean
   ignore_context_canceled: boolean
   ignore_no_available_accounts: boolean