feat: 收视分析页面（指标卡 + 走势图 + 路由导航）

frontend/src/components/Layout/SideNav.jsx

@@ -8,6 +8,7 @@ import {
   UserOutlined,
   TeamOutlined,
   SoundOutlined,
+  LineChartOutlined,
 } from '@ant-design/icons'
 import useAuthStore from '../../stores/authStore'
 
@@ -18,6 +19,7 @@ function SideNav() {
 
   const allMenuItems = [
     { key: '/dashboard', icon: <DashboardOutlined />, label: '仪表盘' },
+    { key: '/analytics', icon: <LineChartOutlined />, label: '收视分析' },
     { key: '/editor-desk', icon: <FileTextOutlined />, label: '责编录入' },
     { key: '/tps', icon: <FileTextOutlined />, label: 'TPS 选题策划' },
     { key: '/knowledge', icon: <BookOutlined />, label: '知识库' },
@@ -53,6 +55,8 @@ function SideNav() {
   const visibleItems = allMenuItems.filter(item => {
     // /dashboard 三角色都可见
     if (item.key === '/dashboard') return true
+    // /analytics 三角色都可见
+    if (item.key === '/analytics') return true
     // /users 仅 zhipianren
     if (item.key === '/users') return String(user?.role) === 'zhipianren'
     // /editor-desk 仅 zhipianren + zebian