feat(gateway): 添加流超时处理机制

- 添加 StreamTimeoutSettings 配置结构体和系统设置
- 实现 TimeoutCounterCache Redis 计数器用于累计超时次数
- 在 RateLimitService 添加 HandleStreamTimeout 方法
- 在 gateway_service、openai_gateway_service、antigravity_gateway_service 中调用超时处理
- 添加后端 API 端点 GET/PUT /admin/settings/stream-timeout
- 添加前端配置界面到系统设置页面
- 支持配置：启用开关、超时阈值、处理方式、暂停时长、触发阈值、阈值窗口

默认配置：
- 启用：true
- 超时阈值：60秒
- 处理方式：临时不可调度
- 暂停时长：5分钟
- 触发阈值：3次
- 阈值窗口：10分钟

frontend/src/api/admin/settings.ts

@@ -201,6 +201,42 @@ export async function deleteAdminApiKey(): Promise<{ message: string }> {
   return data
 }
 
+/**
+ * Stream timeout settings interface
+ */
+export interface StreamTimeoutSettings {
+  enabled: boolean
+  timeout_seconds: number
+  action: 'temp_unsched' | 'error' | 'none'
+  temp_unsched_minutes: number
+  threshold_count: number
+  threshold_window_minutes: number
+}
+
+/**
+ * Get stream timeout settings
+ * @returns Stream timeout settings
+ */
+export async function getStreamTimeoutSettings(): Promise<StreamTimeoutSettings> {
+  const { data } = await apiClient.get<StreamTimeoutSettings>('/admin/settings/stream-timeout')
+  return data
+}
+
+/**
+ * Update stream timeout settings
+ * @param settings - Stream timeout settings to update
+ * @returns Updated settings
+ */
+export async function updateStreamTimeoutSettings(
+  settings: StreamTimeoutSettings
+): Promise<StreamTimeoutSettings> {
+  const { data } = await apiClient.put<StreamTimeoutSettings>(
+    '/admin/settings/stream-timeout',
+    settings
+  )
+  return data
+}
+
 export const settingsAPI = {
   getSettings,
   updateSettings,
@@ -208,7 +244,9 @@ export const settingsAPI = {
   sendTestEmail,
   getAdminApiKey,
   regenerateAdminApiKey,
-  deleteAdminApiKey
+  deleteAdminApiKey,
+  getStreamTimeoutSettings,
+  updateStreamTimeoutSettings
 }
 
 export default settingsAPI

frontend/src/i18n/locales/en.ts

@@ -2512,6 +2512,27 @@ export default {
         securityWarning: 'Warning: This key provides full admin access. Keep it secure.',
         usage: 'Usage: Add to request header - x-api-key: <your-admin-api-key>'
       },
+      streamTimeout: {
+        title: 'Stream Timeout Handling',
+        description: 'Configure account handling strategy when upstream response times out',
+        enabled: 'Enable Stream Timeout Handling',
+        enabledHint: 'Automatically handle problematic accounts when upstream times out',
+        timeoutSeconds: 'Timeout Threshold (seconds)',
+        timeoutSecondsHint: 'Stream data interval exceeding this time is considered timeout (30-300s)',
+        action: 'Action',
+        actionTempUnsched: 'Temporarily Unschedulable',
+        actionError: 'Mark as Error',
+        actionNone: 'No Action',
+        actionHint: 'Action to take on the account after timeout',
+        tempUnschedMinutes: 'Pause Duration (minutes)',
+        tempUnschedMinutesHint: 'Duration of temporary unschedulable state (1-60 minutes)',
+        thresholdCount: 'Trigger Threshold (count)',
+        thresholdCountHint: 'Number of timeouts before triggering action (1-10)',
+        thresholdWindowMinutes: 'Threshold Window (minutes)',
+        thresholdWindowMinutesHint: 'Time window for counting timeouts (1-60 minutes)',
+        saved: 'Stream timeout settings saved',
+        saveFailed: 'Failed to save stream timeout settings'
+      },
       saveSettings: 'Save Settings',
       saving: 'Saving...',
       settingsSaved: 'Settings saved successfully',

frontend/src/i18n/locales/zh.ts

@@ -2696,6 +2696,27 @@ export default {
         securityWarning: '警告：此密钥拥有完整的管理员权限，请妥善保管。',
         usage: '使用方法：在请求头中添加 x-api-key: <your-admin-api-key>'
       },
+      streamTimeout: {
+        title: '流超时处理',
+        description: '配置上游响应超时时的账户处理策略，避免问题账户持续被选中',
+        enabled: '启用流超时处理',
+        enabledHint: '当上游响应超时时，自动处理问题账户',
+        timeoutSeconds: '超时阈值（秒）',
+        timeoutSecondsHint: '流数据间隔超过此时间视为超时（30-300秒）',
+        action: '处理方式',
+        actionTempUnsched: '临时不可调度',
+        actionError: '标记为错误状态',
+        actionNone: '不处理',
+        actionHint: '超时后对账户执行的操作',
+        tempUnschedMinutes: '暂停时长（分钟）',
+        tempUnschedMinutesHint: '临时不可调度的持续时间（1-60分钟）',
+        thresholdCount: '触发阈值（次数）',
+        thresholdCountHint: '累计超时多少次后触发处理（1-10次）',
+        thresholdWindowMinutes: '阈值窗口（分钟）',
+        thresholdWindowMinutesHint: '超时计数的时间窗口（1-60分钟）',
+        saved: '流超时设置保存成功',
+        saveFailed: '保存流超时设置失败'
+      },
       saveSettings: '保存设置',
       saving: '保存中...',
       settingsSaved: '设置保存成功',

frontend/src/views/admin/SettingsView.vue

@@ -147,6 +147,161 @@
           </div>
         </div>
 
+        <!-- Stream Timeout Settings -->
+        <div class="card">
+          <div class="border-b border-gray-100 px-6 py-4 dark:border-dark-700">
+            <h2 class="text-lg font-semibold text-gray-900 dark:text-white">
+              {{ t('admin.settings.streamTimeout.title') }}
+            </h2>
+            <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">
+              {{ t('admin.settings.streamTimeout.description') }}
+            </p>
+          </div>
+          <div class="space-y-5 p-6">
+            <!-- Loading State -->
+            <div v-if="streamTimeoutLoading" class="flex items-center gap-2 text-gray-500">
+              <div class="h-4 w-4 animate-spin rounded-full border-b-2 border-primary-600"></div>
+              {{ t('common.loading') }}
+            </div>
+
+            <template v-else>
+              <!-- Enable Stream Timeout -->
+              <div class="flex items-center justify-between">
+                <div>
+                  <label class="font-medium text-gray-900 dark:text-white">{{
+                    t('admin.settings.streamTimeout.enabled')
+                  }}</label>
+                  <p class="text-sm text-gray-500 dark:text-gray-400">
+                    {{ t('admin.settings.streamTimeout.enabledHint') }}
+                  </p>
+                </div>
+                <Toggle v-model="streamTimeoutForm.enabled" />
+              </div>
+
+              <!-- Settings - Only show when enabled -->
+              <div
+                v-if="streamTimeoutForm.enabled"
+                class="space-y-4 border-t border-gray-100 pt-4 dark:border-dark-700"
+              >
+                <!-- Timeout Seconds -->
+                <div>
+                  <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
+                    {{ t('admin.settings.streamTimeout.timeoutSeconds') }}
+                  </label>
+                  <input
+                    v-model.number="streamTimeoutForm.timeout_seconds"
+                    type="number"
+                    min="30"
+                    max="300"
+                    class="input w-32"
+                  />
+                  <p class="mt-1.5 text-xs text-gray-500 dark:text-gray-400">
+                    {{ t('admin.settings.streamTimeout.timeoutSecondsHint') }}
+                  </p>
+                </div>
+
+                <!-- Action -->
+                <div>
+                  <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
+                    {{ t('admin.settings.streamTimeout.action') }}
+                  </label>
+                  <select v-model="streamTimeoutForm.action" class="input w-64">
+                    <option value="temp_unsched">{{ t('admin.settings.streamTimeout.actionTempUnsched') }}</option>
+                    <option value="error">{{ t('admin.settings.streamTimeout.actionError') }}</option>
+                    <option value="none">{{ t('admin.settings.streamTimeout.actionNone') }}</option>
+                  </select>
+                  <p class="mt-1.5 text-xs text-gray-500 dark:text-gray-400">
+                    {{ t('admin.settings.streamTimeout.actionHint') }}
+                  </p>
+                </div>
+
+                <!-- Temp Unsched Minutes (only show when action is temp_unsched) -->
+                <div v-if="streamTimeoutForm.action === 'temp_unsched'">
+                  <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
+                    {{ t('admin.settings.streamTimeout.tempUnschedMinutes') }}
+                  </label>
+                  <input
+                    v-model.number="streamTimeoutForm.temp_unsched_minutes"
+                    type="number"
+                    min="1"
+                    max="60"
+                    class="input w-32"
+                  />
+                  <p class="mt-1.5 text-xs text-gray-500 dark:text-gray-400">
+                    {{ t('admin.settings.streamTimeout.tempUnschedMinutesHint') }}
+                  </p>
+                </div>
+
+                <!-- Threshold Count -->
+                <div>
+                  <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
+                    {{ t('admin.settings.streamTimeout.thresholdCount') }}
+                  </label>
+                  <input
+                    v-model.number="streamTimeoutForm.threshold_count"
+                    type="number"
+                    min="1"
+                    max="10"
+                    class="input w-32"
+                  />
+                  <p class="mt-1.5 text-xs text-gray-500 dark:text-gray-400">
+                    {{ t('admin.settings.streamTimeout.thresholdCountHint') }}
+                  </p>
+                </div>
+
+                <!-- Threshold Window Minutes -->
+                <div>
+                  <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
+                    {{ t('admin.settings.streamTimeout.thresholdWindowMinutes') }}
+                  </label>
+                  <input
+                    v-model.number="streamTimeoutForm.threshold_window_minutes"
+                    type="number"
+                    min="1"
+                    max="60"
+                    class="input w-32"
+                  />
+                  <p class="mt-1.5 text-xs text-gray-500 dark:text-gray-400">
+                    {{ t('admin.settings.streamTimeout.thresholdWindowMinutesHint') }}
+                  </p>
+                </div>
+              </div>
+
+              <!-- Save Button -->
+              <div class="flex justify-end border-t border-gray-100 pt-4 dark:border-dark-700">
+                <button
+                  type="button"
+                  @click="saveStreamTimeoutSettings"
+                  :disabled="streamTimeoutSaving"
+                  class="btn btn-primary btn-sm"
+                >
+                  <svg
+                    v-if="streamTimeoutSaving"
+                    class="mr-1 h-4 w-4 animate-spin"
+                    fill="none"
+                    viewBox="0 0 24 24"
+                  >
+                    <circle
+                      class="opacity-25"
+                      cx="12"
+                      cy="12"
+                      r="10"
+                      stroke="currentColor"
+                      stroke-width="4"
+                    ></circle>
+                    <path
+                      class="opacity-75"
+                      fill="currentColor"
+                      d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+                    ></path>
+                  </svg>
+                  {{ streamTimeoutSaving ? t('common.saving') : t('common.save') }}
+                </button>
+              </div>
+            </template>
+          </div>
+        </div>
+
         <!-- Registration Settings -->
         <div class="card">
           <div class="border-b border-gray-100 px-6 py-4 dark:border-dark-700">
@@ -840,6 +995,18 @@ const adminApiKeyMasked = ref('')
 const adminApiKeyOperating = ref(false)
 const newAdminApiKey = ref('')
 
+// Stream Timeout 状态
+const streamTimeoutLoading = ref(true)
+const streamTimeoutSaving = ref(false)
+const streamTimeoutForm = reactive({
+  enabled: true,
+  timeout_seconds: 60,
+  action: 'temp_unsched' as 'temp_unsched' | 'error' | 'none',
+  temp_unsched_minutes: 5,
+  threshold_count: 3,
+  threshold_window_minutes: 10
+})
+
 type SettingsForm = SystemSettings & {
   smtp_password: string
   turnstile_secret_key: string
@@ -1129,8 +1296,44 @@ function copyNewKey() {
     })
 }
 
+// Stream Timeout 方法
+async function loadStreamTimeoutSettings() {
+  streamTimeoutLoading.value = true
+  try {
+    const settings = await adminAPI.settings.getStreamTimeoutSettings()
+    Object.assign(streamTimeoutForm, settings)
+  } catch (error: any) {
+    console.error('Failed to load stream timeout settings:', error)
+  } finally {
+    streamTimeoutLoading.value = false
+  }
+}
+
+async function saveStreamTimeoutSettings() {
+  streamTimeoutSaving.value = true
+  try {
+    const updated = await adminAPI.settings.updateStreamTimeoutSettings({
+      enabled: streamTimeoutForm.enabled,
+      timeout_seconds: streamTimeoutForm.timeout_seconds,
+      action: streamTimeoutForm.action,
+      temp_unsched_minutes: streamTimeoutForm.temp_unsched_minutes,
+      threshold_count: streamTimeoutForm.threshold_count,
+      threshold_window_minutes: streamTimeoutForm.threshold_window_minutes
+    })
+    Object.assign(streamTimeoutForm, updated)
+    appStore.showSuccess(t('admin.settings.streamTimeout.saved'))
+  } catch (error: any) {
+    appStore.showError(
+      t('admin.settings.streamTimeout.saveFailed') + ': ' + (error.message || t('common.unknownError'))
+    )
+  } finally {
+    streamTimeoutSaving.value = false
+  }
+}
+
 onMounted(() => {
   loadSettings()
   loadAdminApiKey()
+  loadStreamTimeoutSettings()
 })
 </script>