merge fix/settings-trim: dead settings, upstream remnants, JSON/Clash subscriptions removed

# Conflicts:
#	frontend/src/models/setting.ts
#	frontend/src/pages/settings/GeneralTab.tsx
#	frontend/src/pages/settings/SettingsPage.tsx
#	frontend/src/pages/settings/SubscriptionBalancersTab.tsx
#	frontend/src/pages/xray/outbounds/OutboundsTab.css
#	frontend/src/schemas/setting.ts

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);
@@ -254,22 +250,8 @@ export default function AppSidebar() {
         label: t('pages.settings.probeThemes.title'),
       },
     ];
-    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 settingsActive = pathname === '/settings';
   const selectedKey = settingsActive