精简版第四轮补裁(P4): 页面层摘除 + Xray更新端点下线 + 本机核心监管下线

页面层(用户真机截图发现前两轮漏裁):
- 设置: 摘除 Telegram机器人/邮件菜单与页面, 及页内残留入口(通知页/外部流量/LDAP/2FA设置页)
- Xray配置: 摘除负载均衡/DNS/高级配置菜单与页面; 基础配置(出站+路由)完好
- 总览: 摘除 Xray更新弹窗(VersionModal+GeodataSection)全部入口, 版本号改为静态展示
- 13个locale同步摘除461个已删功能专属翻译键(逐键核查前后端引用为零; i18n-dead-keys测试全绿)

Xray更新后端(经调查确认仅服务本机bin/xray, 与agent下发/订阅无关):
- 删除 getXrayVersion/installXray/updateGeofile 路由与handler(访问返回404)
- 删除 ServerService 对应实现与校验和函数; 同步api-docs/monitor白名单/openapi

本机核心监管下线(设计: 主控永不运行本机xray, 入站全在agent):
- XrayService.RestartXray 降级为no-op(一次性Warning说明日志); StopXray无进程时幂等返回
- web.go 摘除启动拉起本机核心/CheckXrayRunning看门狗(1s)/ApplyPendingRestart cron(30s)/XrayTrafficJob/CheckClientIpJob 注册
- ApplyPendingRestart 降级为消费即清, 其测试更新为新语义
- XrayMetricsService.Sample 短路: 不再每2s探本机/debug/vars, 状态优雅置为不可用
- 配置生成(纯JSON)/agent链路/订阅/入站CRUD未动; 状态读数优雅归零(stop/Unknown)

注: TestGetXrayConfig_EnabledClientsStillEmitted 在基线945b3a5同样失败(既有问题, 非本轮引入)

frontend/src/layouts/AppSidebar.tsx

@@ -12,16 +12,13 @@ import {
   ClusterOutlined,
   CodeOutlined,
   DashboardOutlined,
-  DatabaseOutlined,
   ExportOutlined,
   GithubOutlined,
   GlobalOutlined,
   HeartOutlined,
   ImportOutlined,
   LogoutOutlined,
-  MailOutlined,
   MenuOutlined,
-  MessageOutlined,
   MoonFilled,
   MoonOutlined,
   PushpinFilled,
@@ -245,12 +242,6 @@ export default function AppSidebar() {
         icon: <SafetyOutlined />,
         label: t('pages.settings.securitySettings'),
       },
-      {
-        key: '/settings#telegram',
-        icon: <MessageOutlined />,
-        label: t('pages.settings.TGBotSettings'),
-      },
-      { key: '/settings#email', icon: <MailOutlined />, label: t('pages.settings.emailSettings') },
       {
         key: '/settings#subscription',
         icon: <CloudServerOutlined />,
@@ -275,12 +266,7 @@ export default function AppSidebar() {
   }, [t, showSubFormats, showSubBalancers]);
 
   const xrayChildren = useMemo<NonNullable<MenuProps['items']>>(
-    () => [
-      { key: '/xray#basic', icon: <SettingOutlined />, label: t('pages.xray.basicTemplate') },
-      { key: '/xray#balancer', icon: <ClusterOutlined />, label: t('pages.xray.Balancers') },
-      { key: '/xray#dns', icon: <DatabaseOutlined />, label: 'DNS' },
-      { key: '/xray#advanced', icon: <CodeOutlined />, label: t('pages.xray.advancedTemplate') },
-    ],
+    () => [{ key: '/xray#basic', icon: <SettingOutlined />, label: t('pages.xray.basicTemplate') }],
     [t],
   );