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

- TopK initial filter now drops quota-paused accounts: fold the quota check
  into isAccountRequestCompatible so session-hash, TopK pool, and per-candidate
  rechecks all skip paused accounts. Previously the candidate pool was built
  without the quota check, so paused accounts could fill TopK and leave the
  scheduler returning "no available accounts" even with healthy ones available.
- Add per-account explicit disable flags auto_pause_5h_disabled /
  auto_pause_7d_disabled with toggles in EditAccountModal. Without these,
  leaving the account threshold blank silently falls back to the global default,
  so admins could not exempt a single account once a global default existed.
  Disable is per-window: an account can opt out of 5h auto-pause while still
  honoring 7d. Schedule snapshot whitelist includes the new fields, i18n EN/ZH
  updated, threshold-hint text revised to explain "blank = global default".
- Move quota auto-pause settings off the request hot path: replace the per-repo
  TTL+singleflight sync DB read with a per-SettingService stale-while-revalidate
  in-memory snapshot. Get is non-blocking (atomic.Pointer load + async refresh
  on staleness); writes via UpdateOpsAdvancedSettings push directly into the
  cache through an injected sink; wire warms the cache at startup. Adds Warm
  (sync) for tests/init and SetOpenAIQuotaAutoPauseSettings (sink target).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/i18n/locales/en.ts

@@ -3477,7 +3477,10 @@ export default {
       autoPauseOnExpiredDesc: 'When enabled, the account will auto pause scheduling after it expires',
 	  autoPause5hThreshold: '5h Usage Threshold (%)',
 	  autoPause7dThreshold: '7d Usage Threshold (%)',
-	  autoPauseThresholdHint: 'Leave empty or set 0 to disable. Reaching the threshold only skips the account during scheduling and does not modify schedulable.',
+	  autoPauseThresholdHint: 'Leave empty or set 0 to use the global default threshold (configured in Ops settings); set a value to override the global default. Reaching the threshold only skips the account during scheduling and does not modify schedulable.',
+	  autoPause5hDisabled: 'Disable 5h auto-pause',
+	  autoPause7dDisabled: 'Disable 7d auto-pause',
+	  autoPauseDisabledHint: 'When enabled, this account is never auto-paused (even if a global default threshold is configured).',
       // Quota control (Anthropic OAuth/SetupToken only)
       quotaControl: {
         title: 'Quota Control',

frontend/src/i18n/locales/zh.ts

@@ -3615,7 +3615,10 @@ export default {
       autoPauseOnExpiredDesc: '启用后，账号过期将自动暂停调度',
 	  autoPause5hThreshold: '5h 用量阈值(%)',
 	  autoPause7dThreshold: '7d 用量阈值(%)',
-	  autoPauseThresholdHint: '填 0 或留空表示不启用；达到阈值后仅在调度时跳过账号，不修改 schedulable。',
+	  autoPauseThresholdHint: '留空或填 0 表示使用全局默认阈值（在运维设置中配置）；填具体值则覆盖全局默认。达到阈值后仅在调度时跳过账号，不修改 schedulable。',
+	  autoPause5hDisabled: '禁用 5h 自动暂停',
+	  autoPause7dDisabled: '禁用 7d 自动暂停',
+	  autoPauseDisabledHint: '开启后该账号永不进入自动暂停（即使全局默认阈值已配置）。',
       // Quota control (Anthropic OAuth/SetupToken only)
       quotaControl: {
         title: '配额控制',