导航: 统一分区侧栏 + 新增用量统计页

- ShellLayout 按所在分区显示独立菜单:
  用户控制台(/console) 与 管理后台(/admin) 不混排, 各带跨区跳转(管理→/返回控制台→)
- /console 与 /admin 共用 ShellLayout, 移除 ConsoleLayout/AdminLayout 薄包装
- 新增 /admin/usage 用量统计页(全局请求明细, 按模型过滤+分页)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/router/index.ts

@@ -1,6 +1,8 @@
 import { createRouter, createWebHistory } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
 
+const ShellLayout = () => import('@/components/layout/ShellLayout.vue')
+
 export const router = createRouter({
   history: createWebHistory(),
   routes: [
@@ -9,18 +11,19 @@ export const router = createRouter({
     { path: '/register', name: 'register', component: () => import('@/views/RegisterView.vue'), meta: { guest: true } },
     {
       path: '/console',
-      component: () => import('@/views/console/ConsoleLayout.vue'),
+      component: ShellLayout,
       meta: { auth: true },
       children: [
         { path: '', redirect: '/console/dashboard' },
         { path: 'dashboard', name: 'dashboard', component: () => import('@/views/console/DashboardView.vue') },
         { path: 'keys', name: 'keys', component: () => import('@/views/console/KeysView.vue') },
         { path: 'usage', name: 'usage', component: () => import('@/views/console/UsageView.vue') },
+        { path: 'settings', name: 'settings', component: () => import('@/views/console/SettingsView.vue') },
       ],
     },
     {
       path: '/admin',
-      component: () => import('@/views/admin/AdminLayout.vue'),
+      component: ShellLayout,
       meta: { auth: true, admin: true },
       children: [
         { path: '', redirect: '/admin/overview' },
@@ -28,6 +31,7 @@ export const router = createRouter({
         { path: 'channels', name: 'admin-channels', component: () => import('@/views/admin/ChannelsView.vue') },
         { path: 'models', name: 'admin-models', component: () => import('@/views/admin/ModelsView.vue') },
         { path: 'users', name: 'admin-users', component: () => import('@/views/admin/UsersView.vue') },
+        { path: 'usage', name: 'admin-usage', component: () => import('@/views/admin/UsageView.vue') },
         { path: 'config', name: 'admin-config', component: () => import('@/views/admin/ConfigView.vue') },
       ],
     },