settings trim: remove dead settings, upstream remnants, JSON/Clash subscriptions

Per SETTINGS-AUDIT (all three tiers approved 2026-10-23):

Dead settings:
- panelOutbound, ipLimitAllowlist (+ orphan parser job), outboundDownThreshold
- tg fake events outbound.down/outbound.up/xray.crash (no publisher in lite)
- phantom routing sub-tabs (Happ/Clash/Incy) and subJsonRules direct-rules tab
  (no backend keys); subHideSettings moved to the subscription info tab first

Upstream remnants:
- ldap* / smtp* model+schema keys, EmailNotifications orphan component
- twoFactorEnable/twoFactorToken + login-page probe (no backend handler)
- externalTrafficInform*

Newly approved removals:
- JSON subscription family (producer, routes, UA auto-detect, mux/finalmask/
  observatory) and Clash subscription family (producer, routes, UA detect)
- SubBalancer (table, service, controller, settings tab)
- subThemeDir (subscription page falls back to the built-in template)
- datepicker jalalian option (gregorian only; Persian picker removed)

JSON/Clash endpoints now 404; link-format output pinned by regression tests.
Guarded keys untouched: webListen/webPort/webBasePath/certs, tg* chain,
expireDiff/trafficDiff/tgBotProxy, subHideSettings, pageSize/tgLang.

frontend/src/layouts/AppSidebar.tsx

@@ -6,11 +6,9 @@ import { Drawer, Layout, Menu } from 'antd';
 import type { MenuProps } from 'antd';
 import {
   ApiOutlined,
-  ApartmentOutlined,
   CloseOutlined,
   CloudServerOutlined,
   ClusterOutlined,
-  CodeOutlined,
   DashboardOutlined,
   ExportOutlined,
   GithubOutlined,
@@ -174,9 +172,7 @@ export default function AppSidebar() {
   const { isDark, isUltra, toggleTheme, toggleUltra } = useTheme();
   const navigate = useNavigate();
   const { pathname, hash } = useLocation();
-  const { allSetting } = useAllSettings();
-  const showSubFormats = !!(allSetting.subJsonEnable || allSetting.subClashEnable);
-  const showSubBalancers = !!allSetting.subJsonEnable;
+  useAllSettings();
 
   const [hovered, setHovered] = useState(() => hoveredAcrossRemounts);
   const [pinned, setPinned] = useState(readSidebarPinned);
@@ -252,22 +248,8 @@ export default function AppSidebar() {
         label: t('pages.settings.subSettings'),
       },
     ];
-    if (showSubFormats) {
-      children.push({
-        key: '/settings#subscription-formats',
-        icon: <CodeOutlined />,
-        label: t('menu.subFormats'),
-      });
-    }
-    if (showSubBalancers) {
-      children.push({
-        key: '/settings#subscription-balancers',
-        icon: <ApartmentOutlined />,
-        label: t('pages.settings.subBalancers.menu'),
-      });
-    }
     return children;
-  }, [t, showSubFormats, showSubBalancers]);
+  }, [t]);
 
   const xrayChildren = useMemo<NonNullable<MenuProps['items']>>(
     () => [{ key: '/xray#basic', icon: <SettingOutlined />, label: t('pages.xray.basicTemplate') }],