feat: KPI细条新增两项完成率 + 侧边菜单加两个占位项

frontend/src/components/Layout/SideNav.jsx

@@ -7,6 +7,7 @@ import {
   SyncOutlined,
   UserOutlined,
   TeamOutlined,
+  SoundOutlined,
 } from '@ant-design/icons'
 import useAuthStore from '../../stores/authStore'
 
@@ -23,6 +24,28 @@ function SideNav() {
     { key: '/doco', icon: <SyncOutlined />, label: '文稿对齐' },
     { key: '/editor-home', icon: <UserOutlined />, label: '个人首页' },
     { key: '/users', icon: <TeamOutlined />, label: '用户管理' },
+    {
+      key: 'tts-placeholder',
+      icon: <SoundOutlined />,
+      label: (
+        <span className="menu-item-with-tag">
+          蓝皓配音 TTS 2.0
+          <span className="menu-soon-tag">即将上线</span>
+        </span>
+      ),
+      disabled: true,
+    },
+    {
+      key: 'collab-placeholder',
+      icon: <TeamOutlined />,
+      label: (
+        <span className="menu-item-with-tag">
+          内部协作（Mattermost）
+          <span className="menu-soon-tag">即将上线</span>
+        </span>
+      ),
+      disabled: true,
+    },
   ]
 
   // 按角色过滤菜单项