feat(admin): 支持定时测试自动恢复并统一账号恢复入口

- 为定时测试计划增加 auto_recover 配置，补齐前后端类型、接口、仓储与数据库迁移
- 在定时测试成功后自动恢复账号 error、rate-limit 等可恢复运行时状态
- 新增 /admin/accounts/:id/recover-state 接口，合并原有重置状态与清限流操作
- 更新账号管理菜单与定时测试面板，补充自动恢复开关、说明提示和状态展示
- 补充账号恢复、限流清理与仓储同步相关测试

frontend/src/i18n/locales/en.ts

@@ -1772,9 +1772,9 @@ export default {
         remaining: 'Remaining',
         matchedKeyword: 'Matched Keyword',
         errorMessage: 'Error Details',
-        reset: 'Reset Status',
-        resetSuccess: 'Temp unschedulable status reset',
-        resetFailed: 'Failed to reset temp unschedulable status',
+        reset: 'Recover State',
+        resetSuccess: 'Account state recovered successfully',
+        resetFailed: 'Failed to recover account state',
         failedToLoad: 'Failed to load temp unschedulable status',
         notActive: 'This account is not temporarily unschedulable.',
         expired: 'Expired',
@@ -1840,6 +1840,10 @@ export default {
       bulkDeleteSuccess: 'Deleted {count} account(s)',
       bulkDeletePartial: 'Partially deleted: {success} succeeded, {failed} failed',
       bulkDeleteFailed: 'Bulk delete failed',
+      recoverState: 'Recover State',
+      recoverStateHint: 'Used to recover error, rate-limit, and temporary unschedulable runtime state.',
+      recoverStateSuccess: 'Account state recovered successfully',
+      recoverStateFailed: 'Failed to recover account state',
       resetStatus: 'Reset Status',
       statusReset: 'Account status reset successfully',
       failedToResetStatus: 'Failed to reset account status',
@@ -2471,7 +2475,21 @@ export default {
       failed: 'Failed',
       running: 'Running',
       schedule: 'Schedule',
-      cronHelp: 'Standard 5-field cron expression (e.g., */30 * * * *)'
+      cronHelp: 'Standard 5-field cron expression (e.g., */30 * * * *)',
+      cronTooltipTitle: 'Cron expression examples:',
+      cronTooltipMeaning: 'Defines when the test runs automatically. The 5 fields are: minute, hour, day, month, and weekday.',
+      cronTooltipExampleEvery30Min: '*/30 * * * *: run every 30 minutes',
+      cronTooltipExampleHourly: '0 * * * *: run at the start of every hour',
+      cronTooltipExampleDaily: '0 9 * * *: run every day at 09:00',
+      cronTooltipExampleWeekly: '0 9 * * 1: run every Monday at 09:00',
+      cronTooltipRange: 'Recommended range: use standard 5-field cron. For health checks, start with a moderate frequency such as every 30 minutes, every hour, or once a day instead of running too often.',
+      maxResultsTooltipTitle: 'What Max Results means:',
+      maxResultsTooltipMeaning: 'Sets how many historical test results are kept for a single plan so the result list does not grow without limit.',
+      maxResultsTooltipBody: 'Only the newest test results are kept. Once the number of saved results exceeds this value, older records are pruned automatically so the history list and storage stay under control.',
+      maxResultsTooltipExample: 'For example, 100 means keeping at most the latest 100 test results. When the 101st result is saved, the oldest one is removed.',
+      maxResultsTooltipRange: 'Recommended range: usually 20 to 200. Use 20-50 when you only care about recent health status, or 100-200 if you want a longer trend history.',
+      autoRecover: 'Auto Recover',
+      autoRecoverHelp: 'Automatically recover account from error/rate-limited state on successful test'
     },
 
     // Proxies