refactor: 共享请求管道、按需懒加载、流式内存护栏与连接池治理

- 抽取 ApiRequestPipeline 单例，44 个路由文件共享同一实例
- Handler/Adapter 模块级 __getattr__ 延迟导入，减少启动时间
- 新增 ensure_stream_buffer_limit() 流式内存护栏（16MB 单行 / 32MB 总量）
- HTTP 空闲连接清理与 curl_cffi LRU 会话池
- ensure_providers_bootstrapped 按需引导指定 provider_types
- Usage 事件序列化迁移至 msgpack，Redis codec 隔离
- 启动预热任务（/readyz 就绪门控）与优雅关闭
- 通知邮件模块独立开关与 SMTP 配置校验
- CryptoService DCL 线程安全修复
- 通知模块开关 DB 查询 30s 内存缓存
- /readyz 对 unknown 状态返回 503
- 预热关闭 5s 超时保护
- 预热适配器逐个 try-except 容错
- FormatConversionRegistry 哨兵模式防并发重复物化
- 流式缓冲检查无条件执行

Closes #230

Co-authored-by: AAEE86 <ppk0227@hotmail.com>

frontend/src/composables/useCountdownTimer.ts

@@ -68,6 +68,77 @@ export function getProbeCountdown(nextProbeAt: string | null | undefined, _tick:
   return '探测中'
 }
 
+/**
+ * Codex 配额重置倒计时状态
+ */
+export interface CodexResetStatus {
+  text: string
+  isUrgent: boolean
+  isCritical: boolean
+  isExpired: boolean
+}
+
+/**
+ * 计算 Codex 配额重置倒计时
+ * @param resetAt 绝对重置时间（Unix 秒）
+ * @param resetSecs 相对剩余秒数（用于 fallback）
+ * @param updatedAt 元数据更新时间（Unix 秒）
+ * @param _tick 响应式触发器（传入 tick.value 以触发响应式更新）
+ */
+export function getCodexResetCountdown(
+  resetAt: number | null | undefined,
+  resetSecs: number | null | undefined,
+  updatedAt: number | null | undefined,
+  _tick: number
+): CodexResetStatus | null {
+  void _tick
+
+  const nowSec = Math.floor(Date.now() / 1000)
+  let remaining: number
+
+  if (resetAt != null && resetAt > 0) {
+    // 优先绝对时间戳，避免相对秒数快照漂移。
+    remaining = resetAt - nowSec
+  } else if (resetSecs != null && resetSecs >= 0) {
+    if (updatedAt != null && updatedAt > 0) {
+      // 时钟偏移下 updatedAt 可能晚于当前时间，elapsed 需要下限钳制到 0。
+      const elapsedSec = Math.max(nowSec - updatedAt, 0)
+      remaining = resetSecs - elapsedSec
+    } else {
+      remaining = resetSecs
+    }
+  } else {
+    return null
+  }
+
+  if (remaining <= 0) {
+    return { text: '已重置', isUrgent: false, isCritical: false, isExpired: true }
+  }
+
+  const total = Math.floor(remaining)
+  const days = Math.floor(total / 86400)
+  const hours = Math.floor((total % 86400) / 3600)
+  const minutes = Math.floor((total % 3600) / 60)
+  const seconds = total % 60
+  const pad = (n: number) => n.toString().padStart(2, '0')
+
+  let text: string
+  if (days > 0) {
+    text = `${days}天 ${hours}:${pad(minutes)}:${pad(seconds)}`
+  } else if (hours > 0) {
+    text = `${hours}:${pad(minutes)}:${pad(seconds)}`
+  } else {
+    text = `${minutes}:${pad(seconds)}`
+  }
+
+  return {
+    text,
+    isUrgent: total < 3600,
+    isCritical: total < 300,
+    isExpired: false,
+  }
+}
+
 /**
  * OAuth Token 状态信息
  */

frontend/src/features/providers/components/ProviderDetailDrawer.vue

@@ -573,10 +573,19 @@
                             />
                           </div>
                           <div
-                            v-if="key.upstream_metadata.codex.primary_reset_seconds"
-                            class="text-[9px] text-muted-foreground/70 mt-0.5"
+                            v-if="key.upstream_metadata.codex.primary_reset_at || key.upstream_metadata.codex.primary_reset_seconds"
+                            class="text-[9px] mt-0.5 tabular-nums"
+                            :class="getResetCountdownClass(
+                              key.upstream_metadata.codex.primary_reset_at,
+                              key.upstream_metadata.codex.primary_reset_seconds,
+                              key.upstream_metadata.codex.updated_at
+                            )"
                           >
-                            {{ formatResetTime(key.upstream_metadata.codex.primary_reset_seconds) }}后重置
+                            {{ getResetCountdownText(
+                              key.upstream_metadata.codex.primary_reset_at,
+                              key.upstream_metadata.codex.primary_reset_seconds,
+                              key.upstream_metadata.codex.updated_at
+                            ) }}
                           </div>
                         </div>
                         <!-- 5H限额（仅 Team/Plus/Enterprise 显示） -->
@@ -594,9 +603,20 @@
                               :style="{ width: `${Math.max(100 - key.upstream_metadata.codex.secondary_used_percent, 0)}%` }"
                             />
                           </div>
-                          <div class="text-[9px] text-muted-foreground/70 mt-0.5">
-                            <template v-if="key.upstream_metadata.codex.secondary_reset_seconds">
-                              {{ formatResetTime(key.upstream_metadata.codex.secondary_reset_seconds) }}后重置
+                          <div
+                            class="text-[9px] mt-0.5 tabular-nums"
+                            :class="getResetCountdownClass(
+                              key.upstream_metadata.codex.secondary_reset_at,
+                              key.upstream_metadata.codex.secondary_reset_seconds,
+                              key.upstream_metadata.codex.updated_at
+                            )"
+                          >
+                            <template v-if="key.upstream_metadata.codex.secondary_reset_at || key.upstream_metadata.codex.secondary_reset_seconds">
+                              {{ getResetCountdownText(
+                                key.upstream_metadata.codex.secondary_reset_at,
+                                key.upstream_metadata.codex.secondary_reset_seconds,
+                                key.upstream_metadata.codex.updated_at
+                              ) }}
                             </template>
                             <template v-else>
                               已重置
@@ -1063,7 +1083,7 @@ import { Popover, PopoverTrigger, PopoverContent } from '@/components/ui'
 import { useToast } from '@/composables/useToast'
 import { useConfirm } from '@/composables/useConfirm'
 import { useClipboard } from '@/composables/useClipboard'
-import { useCountdownTimer, formatCountdown, getOAuthExpiresCountdown } from '@/composables/useCountdownTimer'
+import { useCountdownTimer, formatCountdown, getOAuthExpiresCountdown, getCodexResetCountdown } from '@/composables/useCountdownTimer'
 import {
   getProvider,
   getProviderEndpoints,
@@ -2526,6 +2546,28 @@ function getAntigravityQuotaSummary(metadata: UpstreamMetadata | null | undefine
   return result
 }
 
+function getResetCountdownText(
+  resetAt: number | null | undefined,
+  resetSecs: number | null | undefined,
+  updatedAt: number | null | undefined
+): string {
+  const status = getCodexResetCountdown(resetAt, resetSecs, updatedAt, countdownTick.value)
+  if (!status) return ''
+  return status.isExpired ? status.text : `${status.text} 后重置`
+}
+
+function getResetCountdownClass(
+  resetAt: number | null | undefined,
+  resetSecs: number | null | undefined,
+  updatedAt: number | null | undefined
+): string {
+  const status = getCodexResetCountdown(resetAt, resetSecs, updatedAt, countdownTick.value)
+  if (!status || status.isExpired) return 'text-muted-foreground/70'
+  if (status.isCritical) return 'text-destructive font-medium animate-pulse'
+  if (status.isUrgent) return 'text-amber-500 dark:text-amber-400'
+  return 'text-muted-foreground/70'
+}
+
 // 格式化重置时间
 function formatResetTime(seconds: number): string {
   const days = Math.floor(seconds / 86400)

frontend/src/views/admin/PoolManagement.vue

@@ -516,7 +516,7 @@
                       :key="`${key.key_id}-quota-${idx}`"
                       class="w-full"
                     >
-                      <div class="h-4 grid grid-cols-[20px_minmax(0,1fr)_42px] items-center gap-1 text-[10px] leading-tight">
+                      <div class="min-h-4 grid grid-cols-[20px_minmax(0,1fr)_42px] items-center gap-1 text-[10px] leading-tight">
                         <span
                           class="text-muted-foreground whitespace-nowrap text-right tabular-nums"
                           :title="getQuotaProgressTooltip(item)"
@@ -1153,7 +1153,7 @@ import {
 import RefreshButton from '@/components/ui/refresh-button.vue'
 import { useToast } from '@/composables/useToast'
 import { useClipboard } from '@/composables/useClipboard'
-import { useCountdownTimer, getOAuthExpiresCountdown } from '@/composables/useCountdownTimer'
+import { useCountdownTimer, getOAuthExpiresCountdown, getCodexResetCountdown } from '@/composables/useCountdownTimer'
 import { useConfirm } from '@/composables/useConfirm'
 import { parseApiError } from '@/utils/errorParser'
 import {
@@ -2426,10 +2426,22 @@ function getQuotaProgressLabel(label: string): string {
   return label
 }
 
+function getQuotaProgressCountdown(item: QuotaProgressItem) {
+  if ((item.label !== '5H' && item.label !== '周') || item.resetAtSeconds == null) return null
+  return getCodexResetCountdown(item.resetAtSeconds, null, null, countdownTick.value)
+}
+
+function getQuotaProgressCountdownText(item: QuotaProgressItem): string {
+  const status = getQuotaProgressCountdown(item)
+  if (!status) return ''
+  return status.isExpired ? status.text : `${status.text} 后重置`
+}
+
 function getQuotaProgressTooltip(item: QuotaProgressItem): string {
   const detail = item.detail?.trim() || ''
-  if ((item.label === '5H' || item.label === '周') && item.resetAtSeconds != null) {
-    return `${formatQuotaInlineCountdown(item.resetAtSeconds)} 后重置`
+  const countdownText = getQuotaProgressCountdownText(item)
+  if (countdownText) {
+    return countdownText
   }
   return detail
 }
@@ -2472,26 +2484,6 @@ function parseQuotaResetRemainingSeconds(detail: string | undefined): number | n
   return total
 }
 
-function formatQuotaInlineCountdown(resetAtSeconds: number): string {
-  // 触发响应式更新，保持倒计时每秒刷新
-  void countdownTick.value
-
-  const now = Math.floor(Date.now() / 1000)
-  const remain = Math.max(0, Math.floor(resetAtSeconds - now))
-  const days = Math.floor(remain / 86400)
-  const hours = Math.floor((remain % 86400) / 3600)
-  const minutes = Math.floor((remain % 3600) / 60)
-  const seconds = remain % 60
-
-  if (days > 0) {
-    return `${days}d${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}`
-  }
-  if (hours > 0) {
-    return `${hours}:${String(minutes).padStart(2, '0')}`
-  }
-  return `${minutes}:${String(seconds).padStart(2, '0')}`
-}
-
 function parseQuotaProgressItems(quotaText: string | null | undefined): QuotaProgressItem[] {
   if (!quotaText) return []