feat(platform): 合并车辆运维页并优化 3D 画布嵌入体验

将维护策略与车队生命周期并入车辆运维 Tab，补充旧路由重定向与 RBAC 页面 key 迁移；改进 Workspace3D 就绪探测与 wwwroot 静态资源。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontends/apps/simple-platform-vue/src/layouts/AppShell.vue

@@ -162,14 +162,12 @@ const ADMIN_MENU: MenuItem[] = [
       { path: '/admin/config/system', label: '系统级配置', key: 'admin-config-system' },
       { path: '/admin/config/integrations', label: '外部系统对接', key: 'admin-config-integrations' },
       { path: '/admin/config/routing', label: '路径规划', key: 'admin-config-routing' },
-      { path: '/admin/config/vehicle', label: '车辆维护策略', key: 'admin-config-vehicle' },
       { path: '/admin/config/vehicle-hub', label: '车辆运维', key: 'admin-vehicle-hub' },
       { path: '/admin/config/charge', label: '充电策略', key: 'admin-config-charge' },
       { path: '/admin/config/task', label: '任务分配', key: 'admin-config-task' },
       { path: '/admin/config/traffic', label: '交通管制', key: 'admin-config-traffic' },
       { path: '/admin/config/auth', label: '权限与角色', key: 'admin-config-auth' },
       { path: '/admin/config/device', label: '设备接入', key: 'admin-config-device' },
-      { path: '/admin/config/fleet', label: '车队生命周期', key: 'admin-config-fleet' },
       { path: '/admin/config/scenario', label: '场景模板', key: 'admin-config-scenario' },
       { path: '/admin/config/location', label: '库位管理', key: 'admin-config-location' },
       { path: '/admin/config/ops', label: '运营维护', key: 'admin-config-ops' },