refactor(frontend): move views into app and pages structure

Reorganize the frontend around app-level routing and page modules so the runtime and feature screens share a clearer navigation and composition layout for future work.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/app/navigation/nav.ts

@@ -0,0 +1,34 @@
+import {
+  Activity,
+  BookOpen,
+  Bot,
+  CheckSquare,
+  LayoutGrid,
+  MessageCircle,
+  MessageSquare,
+  Network,
+  Settings,
+  Star,
+  Terminal,
+  type LucideIcon,
+} from 'lucide-vue-next'
+
+export interface NavItem {
+  name: string
+  path: string
+  icon: LucideIcon
+}
+
+export const navItems: NavItem[] = [
+  { name: '沟通系统', path: '/chat', icon: MessageCircle },
+  { name: '智能链路', path: '/agents', icon: Bot },
+  { name: '技能中心', path: '/skills', icon: Star },
+  { name: '资料中枢', path: '/knowledge', icon: BookOpen },
+  { name: '知识大脑', path: '/graph', icon: Network },
+  { name: '任务矩阵', path: '/kanban', icon: LayoutGrid },
+  { name: '任务调度', path: '/todo', icon: CheckSquare },
+  { name: '信息交易所', path: '/forum', icon: MessageSquare },
+  { name: '运行状态', path: '/stats', icon: Activity },
+  { name: '运行日志', path: '/logs', icon: Terminal },
+  { name: '系统设置', path: '/settings', icon: Settings },
+]