fix: simplify top-level settings

apps/web/src/app-shell.tsx

@@ -40,7 +40,6 @@ import {
   type NotificationsDataSource,
 } from './instances/notifications-module.js';
 import { OtaModule, type OtaDataSource } from './instances/ota-module.js';
-import { InstanceSettingsPage } from './settings/instance-settings-page.js';
 import {
   InstanceDetail,
   INSTANCE_MODULE_LABELS,
@@ -69,7 +68,6 @@ export type RouteKind =
   | 'job-detail'
   | 'audit'
   | 'audit-detail'
-  | 'settings-instances'
   | 'settings-instance-detail'
   | 'settings-system'
   | 'not-found';
@@ -139,13 +137,14 @@ function decode(value: string): string {
 export function resolveRoute(input: string): ResolvedRoute {
   const pathname = normalize(input);
   if (pathname === '/') return { kind: 'redirect', pathname, to: '/fleet' };
+  if (pathname === '/settings/instances')
+    return { kind: 'redirect', pathname, to: '/settings/system' };
   const staticRoutes: Readonly<Record<string, RouteKind>> = {
     '/fleet': 'fleet',
     '/automation': 'automation',
     '/instances/new': 'instance-new',
     '/jobs': 'jobs',
     '/audit': 'audit',
-    '/settings/instances': 'settings-instances',
     '/settings/system': 'settings-system',
   };
   if (staticRoutes[pathname]) return { kind: staticRoutes[pathname], pathname };
@@ -270,14 +269,6 @@ function Page({
         }
       />
     );
-  if (route.kind === 'settings-instances')
-    return (
-      <InstanceSettingsPage
-        {...(fleetDataSource ? { dataSource: fleetDataSource } : {})}
-        {...(fleetData ? { initialData: fleetData } : {})}
-        refreshSignal={fleetRefreshSignal}
-      />
-    );
   if (route.kind === 'settings-system') return <ConsoleAuthSettings />;
   if (route.kind === 'not-found')
     return (
@@ -405,7 +396,6 @@ function Page({
     'job-detail': '任务详情',
     audit: '审计',
     'audit-detail': '审计事件',
-    'settings-instances': '实例设置',
     'settings-instance-detail': '实例设置',
     'settings-system': '系统设置',
   };
@@ -432,7 +422,7 @@ const GLOBAL_NAVIGATION: readonly {
 }[] = [
   { section: 'fleet', href: '/fleet', label: '节点', icon: 'grid' },
   { section: 'automation', href: '/automation', label: '自动化', icon: 'jobs' },
-  { section: 'settings', href: '/settings/instances', label: '设置', icon: 'settings' },
+  { section: 'settings', href: '/settings/system', label: '设置', icon: 'settings' },
 ];
 
 const STREAM_LABELS = {
@@ -693,22 +683,6 @@ export function AppShell({
       </header>
       <div className="app-layout app-layout-single">
         <main id="main-content" tabIndex={-1}>
-          {currentSection === 'settings' ? (
-            <nav className="settings-navigation" aria-label="设置导航">
-              <a
-                href="/settings/instances"
-                aria-current={route.kind === 'settings-system' ? undefined : 'page'}
-              >
-                实例管理
-              </a>
-              <a
-                href="/settings/system"
-                aria-current={route.kind === 'settings-system' ? 'page' : undefined}
-              >
-                系统与安全
-              </a>
-            </nav>
-          ) : null}
           {routeInstanceId && instanceLoading ? (
             <p role="status" aria-label="实例加载状态">
               正在加载实例…