feat(api-keys): 支持独立密钥额度重置（手动+定时自动）

- 新增手动重置接口 PATCH /api/admin/api-keys/{id}/reset-usage
- 前端 ApiKeys 页面增加重置按钮，支持确认后归零已使用额度
- 新增独立密钥额度定时自动重置任务，支持配置周期和执行时间
- 支持 all/selected 两种重置模式，selected 模式可指定密钥
- 移除已废弃的 CleanupScheduler 兼容别名

frontend/src/views/admin/SystemSettings.vue

@@ -114,7 +114,14 @@
             id="section-scheduled"
             :scheduled-tasks="scheduledTasks"
             :quota-reset-interval-days="systemConfig.user_quota_reset_interval_days"
+            :standalone-key-reset-interval-days="systemConfig.standalone_key_quota_reset_interval_days"
+            :standalone-key-reset-mode="systemConfig.standalone_key_quota_reset_mode"
+            :standalone-key-reset-key-ids="systemConfig.standalone_key_quota_reset_key_ids"
+            :standalone-keys="standaloneKeys"
             @update:quota-reset-interval-days="systemConfig.user_quota_reset_interval_days = $event"
+            @update:standalone-key-reset-interval-days="systemConfig.standalone_key_quota_reset_interval_days = $event"
+            @update:standalone-key-reset-mode="handleStandaloneKeyResetModeChange"
+            @toggle-standalone-key-reset-key-id="handleToggleStandaloneKeyResetKeyId"
           />
 
           <!-- 系统版本信息 -->
@@ -194,6 +201,7 @@
 import { ref, onMounted, onBeforeUnmount, nextTick } from 'vue'
 import { PageHeader, PageContainer } from '@/components/layout'
 import { useProxyNodesStore } from '@/stores/proxy-nodes'
+import { adminApi } from '@/api/admin'
 
 // Composables
 import { useSystemConfig } from './system-settings/composables/useSystemConfig'
@@ -336,13 +344,50 @@ const {
 const {
   scheduledTasks,
   initPreviousValues,
+  saveStandaloneKeyResetMode,
+  saveStandaloneKeyResetKeyIds,
 } = useScheduledTasks(systemConfig)
 
+// 独立密钥列表（用于定时任务配置中的密钥选择）
+const standaloneKeys = ref<Array<{ id: string; name?: string; key_display?: string; current_balance_usd?: number | null }>>([])
+
+async function loadStandaloneKeys() {
+  try {
+    const result = await adminApi.getAllApiKeys({ limit: 2000 })
+    standaloneKeys.value = result.api_keys.map((k) => ({
+      id: k.id,
+      name: k.name,
+      key_display: k.key_display,
+      current_balance_usd: k.current_balance_usd,
+    }))
+  } catch {
+    // 加载失败不影响其他功能
+  }
+}
+
+function handleStandaloneKeyResetModeChange(mode: string) {
+  systemConfig.value.standalone_key_quota_reset_mode = mode
+  saveStandaloneKeyResetMode(mode)
+}
+
+function handleToggleStandaloneKeyResetKeyId(keyId: string) {
+  const ids = [...systemConfig.value.standalone_key_quota_reset_key_ids]
+  const idx = ids.indexOf(keyId)
+  if (idx >= 0) {
+    ids.splice(idx, 1)
+  } else {
+    ids.push(keyId)
+  }
+  systemConfig.value.standalone_key_quota_reset_key_ids = ids
+  saveStandaloneKeyResetKeyIds(ids)
+}
+
 onMounted(async () => {
   await Promise.all([
     loadSystemConfig(),
     loadSystemVersion(),
     proxyNodesStore.ensureLoaded(),
+    loadStandaloneKeys(),
   ])
   // 配置加载完成后初始化定时任务的原始值
   initPreviousValues()